BG3 Wizard Build: How Portent Dice Make Divination Dominate Honour Mode (All Schools Ranked)

Most BG3 Wizard guides end at “pick Evocation, cast Fireball.” That advice is fine on Balanced difficulty, but in Honour Mode it misses the mechanic that separates a good run from a near-certain wipe: a Divination Wizard’s Portent die set to 1 forces a boss saving throw failure and—because of how Legendary Resistance is coded—bypasses the boss’s +10 LR bonus entirely.

This guide covers all three schools with the concrete mechanics behind each, then explains the Portent/LR interaction with the DC math to prove it works on every Honour Mode legendary boss except Cazador’s Sinister Lord form.

This is a build guide for experienced players. If you are new to the game, start with our BG3 Beginner’s Guide first.

Quick Start Checklist

Whichever school you choose, these five decisions define your Wizard before combat even starts:

Choose Intelligence as your primary stat — aim for 17 at character creation (16 + racial bonus), then push to 20 via Ability Score Improvement at level 8
Take 14 Constitution minimum — Concentration spells like Hypnotic Pattern end the moment you fail a Con save from any hit; bump to 16 if you’re playing Divination (you’ll need your Portent dice for enemies, not yourself)
Pick Alert at level 4 — +5 Initiative means you cast Hypnotic Pattern or Hold Monster before the boss moves; no other feat competes at this level
Scribe your own spell book — buy scrolls of Hold Person, Counterspell, and Fireball from Act 1 vendors; the 25 gp per spell-level cost for your school spells means you can often fill an entire school’s catalogue for under 500 gp
Carry a Shield and equip Medium Armour — if your race grants proficiency (Githyanki, Human), you reach 17–18 AC without sacrificing offensive stats

Why Play Wizard?

The class distinction that matters most is Spell Scribing: Wizards can learn any arcane spell from a scroll, paying gold rather than level-up points. A level 9 Sorcerer has at most nine spells known. A level 9 Wizard with 2,000 gp spent on Act 1 and 2 scrolls can have forty or more. That spell-book flexibility is the reason Wizards stay competitive even when Sorcerer subclasses offer stronger moment-to-moment features — you simply adapt the toolbox to whatever a fight needs.

The cost: Wizards have no Sorcery Points, no natural Bardic Inspiration, and no Warlock Eldritch Blast cantrip as a guaranteed damage floor. Your value is precision preparation, not raw throughput. Summoner-style play fits the BG3 Druid build better; if you want direct damage with self-sufficiency, the Paladin is another path worth considering.

Evocation School — The Damage King

Evocation is the correct choice if your goal is dealing the most damage to the most enemies in the shortest time. Two features define the school:

Sculpt Spells (Level 2) — allies automatically succeed all saving throws against your Evocation spells and take zero damage from them [3]. The practical effect is that you can drop a Fireball on top of your party with zero friendly fire risk. Most other area-of-effect casters need to position carefully or delay; Evocation Wizards just cast.

Empowered Evocation (Level 10) — adds your Intelligence modifier to the damage roll of every Evocation spell [3]. At +5 Intelligence, that’s five extra damage per spell hit. It sounds modest until you consider that a Chain Lightning with four targets adds 20 bonus damage per cast, and a Magic Missile with eight missiles (using a level 5 slot and the Necklace of Elemental Augmentation) adds 40.

The Potent Cantrip feature at level 6 keeps cantrip damage relevant even when enemies succeed their saves — they take half damage rather than none [3]. This matters for fights where you’re conserving higher spell slots.

Evocation’s weakness is that it offers nothing beyond damage. Against bosses with high AC or saving throws, Evocation has no fallback mechanic. You are betting your combat contribution on your spells landing and your targets taking damage.

Abjuration School — The Arcane Tank

Abjuration reframes the Wizard from a glass-cannon backline caster into something that can stand closer to the action without dying immediately. The Arcane Ward is the mechanism:

Arcane Ward (Level 2) — each time you cast an Abjuration spell, the ward’s intensity increases by the spell’s level [4]. The ward absorbs damage equal to its intensity before any hit reaches your HP; maximum intensity equals twice your Wizard level (24 at level 12). After a Long Rest, intensity resets to your Wizard level (12) automatically — you don’t need to spend spell slots to rebuild it from scratch.

In practice, a level 12 Abjuration Wizard walking into a fight has 12 intensity of free effective HP, potentially rising to 24 if you cast Mage Armour, Counterspell, or any other Abjuration spell before taking damage. The ward triggers before your actual HP pool, so you’re functionally harder to burst-kill than a Fighter with similar HP.

Projected Ward (Level 6) enables an allied-protection role: when an adjacent teammate is hit, you can spend ward intensity to absorb the damage on their behalf as a reaction [4]. This turns Abjuration into a genuine support subclass, which makes it the most party-composition-dependent of the three schools.

Improved Abjuration (Level 10) restores ward intensity equal to your Wizard level on each Short Rest [4]. Two short rests per Long Rest cycle means you effectively have three pools of 12+ intensity across a standard dungeon crawl.

Abjuration’s limitation is that it offers no offensive amplification. You deal the same damage as a bare Wizard with none of the ward features. The school trades upside for resilience — correct for solo play or parties with no dedicated tank, marginal in optimised parties where a Fighter or Paladin already handles incoming damage.

Divination School — The Honour Mode Kingmaker

Every guide ranks Divination third or “situational.” In Honour Mode, that ranking inverts. Here’s why.

How Portent Works

After each Long Rest, Divination Wizards roll two d20s and hold the results as Portent Dice [1]. During combat, you can spend one die as a free reaction to replace either an Attack Roll or a Saving Throw — yours, an ally’s, or an enemy’s — with the Portent result. The die must be in range (18m / 60ft from you or the target), but requires no line of sight [1]. At level 6, Expert Divination adds a third die and lets you regenerate spent dice mid-encounter through Prophecy objectives on Short Rests [2].

Two important limits: Portent can only replace Attack Rolls and Saving Throws — not ability checks. And each die is single-use; whatever you rolled at rest stays until spent or the next Long Rest.

The Core Play Pattern

A Portent die of 1, used to replace an enemy’s saving throw, sets that throw’s die result to 1. The total save becomes:

1 (Portent) + enemy’s save modifier = total save vs. your spell DC

At level 12, a typical Wizard spell DC is 8 + 5 (Intelligence modifier at 20) + 5 (proficiency bonus) = DC 18. For an enemy to pass that DC with a Portent die of 1, their save modifier alone would need to be +17 or higher — a number that doesn’t exist in any BG3 boss statblock. A “1” Portent die guarantees failure on any saving throw versus any Wizard spell at standard build parameters.

This converts Hold Monster, Hypnotic Pattern, and Otto’s Irresistible Dance from probabilistic outcomes into guaranteed ones. Two spell slots — Hold Monster followed by Hypnotic Pattern while the boss is stunned — ends most Honour Mode encounters before legendary actions are relevant.

The Legendary Resistance Bypass (The Part Every Other Guide Misses)

Honour Mode bosses have Legendary Resistance: a passive that grants +10 to their next Saving Throw, usable three times per encounter [5]. Against a Control Wizard without Portent, the math works against you — even if you pick Hold Monster with a DC of 18, a boss with a +5 Wisdom modifier and one Legendary Resistance charge passes on a roll of 3 or higher. That’s an 85% pass rate.

Portent changes this entirely. According to the game’s implementation, Legendary Resistance does not activate when the die result being evaluated is a natural 1 or a natural 20 [5]. Because Portent replaces the die value before modifiers are applied, a Portent die of 1 counts as a natural 1 — and Legendary Resistance stays dormant.

The full interaction on a key Act 3 fight:

Gortash has 3 Legendary Resistance charges, +4 Wisdom modifier, and you’re targeting him with Hold Monster (DC 18)
Without Portent: Gortash needs a 14+ to pass naturally, or uses LR to add +10 and pass on any result. Your Hold Monster lands roughly 30–35% of the time before he’s used any LR.
With Portent die = 1: die result is 1, total save = 1 + 4 = 5 vs. DC 18. Fails. LR does not trigger. No charges spent.
Result: Gortash is held, legendary actions can’t fire, your party deletes him.

This works on every Act 3 legendary boss except Cazador in Sinister Lord form — that variant has 99 LR uses [5], meaning even the natural-1 exemption is eventually overwhelmed if the fight goes long enough. The practical counter: use Portent to guarantee the opening Hold Person lands in Phase 1 before Cazador enters Sinister Lord form.

Portent on Your Own Concentration Saves

Portent dice aren’t restricted to enemies. If your Hypnotic Pattern is the only thing keeping four enemies CC’d and you take 40 damage in a single hit, the required Concentration save DC is 10 or half the damage taken (20) — whichever is higher. With a +4 Con modifier and War Caster, you’re still at meaningful risk of a 17+ save. Using a Portent die of 20 on that save guarantees you maintain control of the fight.

This is the strategic split between a “1” die and a “20” die: the “1” is for forcing enemy failures, the “20” is for guaranteeing your own success on critical moments. A level 6 Divination Wizard with three Portent dice can often handle both in a single long encounter.

Which School? — Player-Type Comparison

Player Type	Best School	Why	Skip If
New to Wizard class	Evocation	Sculpt Spells removes friendly fire risk — cast Fireball freely from level 2	You want a support or control playstyle
Casual — wants to finish the game	Abjuration	Arcane Ward provides a forgiving HP buffer; less likely to die to random burst hits	You have a dedicated tank already
Honour Mode runner	Divination	Portent bypasses Legendary Resistance; two Portent dice can lock down or delete any non-Sinister Cazador boss	You dislike managing limited-use resources
Co-op support player	Abjuration	Projected Ward turns you into a reactive shield for the party’s frontline	Your party already has a Cleric filling this role
Min-maxer / Respec enjoyer	Divination → Evocation respec	Use Divination for Acts 1–2 when boss fights are most dangerous; respec to Evocation at level 11 for Empowered Evocation’s Act 3 magic missile nova damage [9]	You prefer a single clean playthrough

Ability Scores, Feats, and Race

Starting Stats

Regardless of school, the stat floor is the same [8][9]:

Intelligence 16 (push to 20 via ASI at level 8) — spell attack bonus and DC scale off this
Constitution 14–16 — higher for Divination players who need Portent dice for enemies, lower for Evocation players who can spare feats
Dexterity 14 — improves Mage Armour AC from 11 to 13 without sacrificing other stats
Strength, Wisdom, Charisma: 8–10; none of these meaningfully improve Wizard performance

Feats

Level 4 — Alert is the non-negotiable choice for Honour Mode [9]. Acting before bosses use Legendary Actions means you can land Hold Monster or Hypnotic Pattern while enemies are still in their default state. Losing initiative against a legendary-action boss is the most common cause of cascading party deaths.

Level 8 — Intelligence +2 brings your Int to 20, raising DC from 17 to 18 — a difference that shifts borderline pass-rates by roughly 5% per save, compounding across a full encounter.

Level 10 — War Caster gives advantage on Concentration saving throws and enables Opportunity Attack spellcasting [7]. For Divination Wizards, this reduces the need to burn a Portent “20” on your own Con saves, freeing it for enemy attacks that would otherwise land.

Race

Githyanki is the highest-value starting race for any Wizard build: Medium Armour proficiency raises your baseline AC to 15 before Mage Armour, and their innate Misty Step saves a spell slot per fight [7]. Human and Half-Elf offer Shield proficiency routes to AC 17–18 if you want heavier defenses at the cost of racial utility features.

Core Spell List

The Wizard’s Spell Scribing advantage means you’re not locked into school-specific spells. These are the highest-value picks at each act for any Wizard build, with Honour Mode prioritisation noted:

Act 1 (Levels 1–5)

Shield — +5 AC reaction; the best defensive spell in the game for its slot cost
Magic Missile — three guaranteed damage instances; bypasses AC entirely
Hold Person — the first save-or-incapacitate spell; combine with Portent “1” in Honour Mode
Misty Step — emergency repositioning without opportunity attacks
Grease — floors enemies cheaply; excellent early crowd control

Act 2 (Levels 6–9)

Fireball — the benchmark AoE; Evocation Wizards use this more than any other spell
Counterspell — mandatory for Honour Mode; stops enemy legendary spells mid-cast
Hypnotic Pattern — area CC that incapacitates on a failed Wisdom save; devastating with Portent
Haste — doubles your action economy for one combat phase; fragile if Concentration breaks
Hold Monster — Hold Person that works on non-humanoids; primary Portent target in Act 2–3

Act 3 (Levels 10–12)

Otto’s Irresistible Dance — forces one target to dance (incapacitated, no dodge AC); Wisdom save or lose; devastating on Honour Mode lieutenants with Portent
Disintegrate — single-target nuke that kills outright at 0 HP; bypasses most resistances
Chain Lightning — four-target AoE with no save required on primary target; Empowered Evocation adds +5 damage per bounce
Power Word: Stun — no save required; simply fires if target is below 150 HP; essential Honour Mode closer

Frequently Asked Questions

Is Divination good outside Honour Mode?

Yes, but the gap between Divination and Evocation closes significantly on lower difficulties. Without Legendary Resistance mechanics in play, Portent’s value comes down to removing RNG from key moments — landing Hold Person on a high-priority target, guaranteeing Hypnotic Pattern hits a group before you’re interrupted. That’s still strong utility, but Evocation’s straightforward damage output is more consistently impactful across a full playthrough.

Can Portent dice force critical hits or critical failures?

Portent replaces the d20 roll with a fixed number. In BG3, a natural 20 on an Attack Roll is a critical hit, and a natural 1 is a critical miss — and Portent numbers behave the same way [1]. A Portent die of 20 on an ally’s attack gives them a guaranteed critical hit, which pairs particularly well with Rogues’ Sneak Attack damage doubling. A Portent die of 1 on an enemy attack cancels their hit entirely (assuming it would have missed at 1 + their attack modifier vs. your AC).

Is Wizard better than Sorcerer in BG3?

They fill different roles. Sorcerer deals more consistent single-round burst through Metamagic — Twinned Spell doubles the targets of Haste or Hold Person without extra spell slots. Wizard’s strength is flexibility and spell variety: you can prepare Counterspell for boss fights, Fireball for trash packs, and Hold Monster for Act 3 encounters without choosing between them at character creation. For Honour Mode, the Divination subclass tips the balance toward Wizard in boss fights specifically; Evocation Sorcerer can be stronger on normal difficulty due to higher Sorcery Point economy.

How do I use Portent for Concentration saves?

When you take damage while concentrating, a notification appears asking if you want to make a Concentration check. Before you roll — or before the automated roll resolves — watch for the Portent reaction prompt. Spend a Portent die of 20 to replace the incoming Con save with 20, guaranteeing success regardless of the damage. This is most impactful when your Hypnotic Pattern or Haste is the battle’s deciding factor and the incoming hit is large enough that even War Caster advantage won’t safely cover it.

Should I multiclass my Wizard?

For Honour Mode Divination builds, stay single-class to level 12. The level 10 Third Eye features (Darkvision and See Invisibility) cost nothing once you reach them, and capping at 12 Wizard means your Portent dice are fully online (three dice at level 6) while your spell slots reach level 6. Multiclassing into Cleric for medium armour proficiency is only worth it if you’re not running Githyanki or a proficiency-granting race. Mixing into Sorcerer for Metamagic is an option if you deprioritise Portent, but then you’re getting neither school’s full benefit — play a Sorcerer instead.

Sources

Michael R.

I've been playing video games for over 20 years, spanning everything from early PC titles to modern open-world games. I started Switchblade Gaming to publish the kind of accurate, well-researched guides I always wanted to find — built on primary sources, tested in-game, and kept up to date after patches. I currently focus on Minecraft and Pokémon GO.