Expedition 33 Lune Build Guide: The 4-Skill Stain Loop That Makes Betelim Hit for Double Damage

Lune’s damage in Clair Obscur: Expedition 33 doesn’t come from her biggest single hit. It comes from a stacking multiplier that punishes hesitation: Betelim, her signature Earth weapon, adds 20% damage every time Lune casts a skill that consumes an elemental Stain — up to five times, for a flat 100% damage bonus [3]. Cast one skill that doesn’t consume a Stain, and the whole stack drops back to zero [3]. The difference between a Lune who’s doing filler damage and one who’s doubling her output isn’t her Attributes or her Pictos. It’s whether she’s casting her four core skills in the right order, every single turn.

Quick Start: The Loop in 5 Steps

New to Lune? Get the core rotation running before you touch anything else:

1. Unlock Earth Rising, Ice Lance, Immolation, and Electrify — all four are core Act 1 skills [4].
2. Open with Earth Rising to plant an Earth Stain on the board [2][4].
3. Follow with Ice Lance, which consumes that Earth Stain for bonus damage and drops a fresh Ice Stain [2][4].
4. Cast Immolation next to consume the Ice Stain and generate a Fire Stain [2][3].
5. Close with Electrify to consume the Fire Stain, generate a Lightning Stain, and reset the loop back to Earth Rising [2][4].

Run that four-skill sequence on repeat and Lune never runs dry on Stains — every cast both pays off the last skill and sets up the next one.

How Lune’s Stain System Actually Works

Every skill Lune casts leaves an elemental Stain on her weapon — Fire, Ice, Lightning, Earth, or the wildcard Light Stain, which substitutes for any of the other four when you don’t have the matching element banked [5][2]. She can hold up to four Stains at once [6]. The mechanic rewards planning one skill ahead: a skill that shares its element with a banked Stain does its normal thing, but a skill that consumes an opposing-element Stain gets a real payoff — extra hits, bonus damage, or a cheaper AP cost, depending on the skill [2]. Immolation is the clearest example: cast it with no Ice Stain banked and it’s a low-damage single hit with 3 Burn stacks; cast it right after Ice Lance, and it consumes that Ice Stain for a real damage spike [1][2]. The Light Stain is what keeps the system from breaking when you’re off-sequence — Ice Lance drops one alongside its Ice Stain, so if you ever cast a skill that wants an element you don’t have banked, the Light Stain quietly covers the gap instead of the cast falling back to baseline [5][2]. Hell leans on this at the high end: it consumes Ice, Earth, and Lightning Stains together for a two-hit Fire nuke, so a common Act 3 opener is running the loop for a few turns to bank all three before firing it off [2].

The Core Rotation: Earth Rising → Ice Lance → Immolation → Electrify

This is the loop the Quick Start steps come from, and it’s a closed circuit — each skill’s output becomes the next skill’s input, with no dead ends:

Ice Lance and Immolation are both low-cost Act 1 starter skills — Fextralife lists them as Starter tier without pinning an exact AP number, so treat them as cheap fillers rather than banking on a specific figure [2]. Earth Rising’s 3 AP cost and Electrify’s roughly 1 AP cost are consistently confirmed across two independent sources, so those you can plan around exactly [4][6]. In practice, the loop only survives contact with a hectic trash pull if Electrify’s Fire-Stain consumption lands before you cast Earth Rising again — miss that window and the sequence (and the Betelim stack riding on it) resets to zero. The most common way players break their own loop isn’t misreading a Stain — it’s opening a fight with whichever skill is already selected from the last battle instead of resetting to Earth Rising. Electrify needs a Fire Stain to consume; cast it cold and it fires unempowered, which means the whole four-skill chain effectively restarts a beat late.

Filler vs Burst: When to Break the Loop

The four-skill loop is Lune’s filler — steady, cheap, and self-sustaining. It’s not her ceiling. Elemental Trick generates one Stain per element on a critical hit, filling the board in a single cast, and Elemental Genesis then consumes one Ice, Lightning, Earth, and Fire Stain together for an eight-hit AoE nuke [1][2]. That’s her burst combo, and it’s worth breaking the loop for — but only under the right conditions:

• If you’re clearing trash or maintaining AP for a long fight, stay in the loop — Elemental Trick and Elemental Genesis cost more AP than the loop returns per cycle and aren’t worth it against low-HP targets.
• If you’re opening a boss fight or a Break-vulnerable target with full AP banked, break the loop for Elemental Trick into Elemental Genesis — the eight-hit spread capitalizes on a full Stain board the loop alone can’t generate in one turn.
• If the enemy resists your currently-banked element, reach for Mayhem instead — it deals non-elemental damage off whatever Stains are already on the board, sidestepping the resistance entirely [5][2].

One trade-off worth knowing before you lean on Mayhem: Betelim’s stack only cares that a skill consumed a Stain, not how many [3]. Burning all four banked Stains in one Mayhem cast nets the same single +20% stack as Electrify consuming one Fire Stain. If you’re actively building the double-damage stack, cycling the four-skill loop and consuming one Stain per cast is the efficient path — Mayhem is for emergencies, not sustained damage. There’s an AP case for the burst combo too: Elemental Trick and Elemental Genesis together run roughly 7 AP for one massive hit, against four loop casts that individually cost far less — the loop wins on AP efficiency over a long fight, the burst combo wins when you need the damage compressed into a single turn [2].

Best Rotation Skills by Act

The core loop doesn’t change across the campaign, but what you pair it with does:

• Act 1: Earth Rising, Ice Lance, Immolation, Electrify, plus Thermal Transfer and Healing Light for utility — this is the full loop plus a safety net [4].
• Act 2: Add Wildfire and Thunderfall for AoE coverage, and start weaving in Mayhem once you’re regularly capping four banked Stains [1][4].
• Act 3: Slot in Elemental Trick and Elemental Genesis for the burst combo above, plus Rockslide or Crustal Crush when a fight calls for Break damage — our Expedition 33 Mime guide covers exactly which enemies are worth stopping the loop for [4].

Why Betelim Is Built for This Exact Rotation

Betelim isn’t just a stat stick — its passive is written specifically around loop discipline. At weapon level 4, every Stain-consuming skill adds 20% damage, stacking up to five times for a flat 100% bonus, and it resets the instant you cast a skill that doesn’t consume a Stain [3]. At level 10 it starts generating two random Stains automatically if you start a turn with none banked, and at level 20 it refunds 1 AP per Stain consumed [3] — both changes exist specifically to keep the loop from stalling out. Run the four-skill rotation with Betelim equipped and every cast after the first is either building toward double damage or actively at it; run the same rotation with a weapon that doesn’t reward Stain consumption and you’re doing the same choreography for a fraction of the payoff. The level 20 AP refund compounds this further: Electrify already costs next to nothing, so refunding 1 AP on the Stain it consumes effectively makes it free on turns where AP is tight, letting you queue up Earth Rising again the same turn instead of passing.

Which Player Type Are You?

FAQ

Do I need Betelim specifically to make this rotation work?
No — the four-skill loop functions on any weapon, since the Stain generate/consume relationships are tied to the skills, not the gear. What you lose without Betelim is the payoff: without its stacking passive, running the loop perfectly and running it sloppily deal roughly the same damage. Betelim is what turns rotation discipline into a measurable damage number.

What actually happens if I miss a step in the sequence?
Two separate costs stack up. First, the skill you cast out of order likely won’t have its matching Stain to consume, so it fires at baseline damage instead of its empowered version [2]. Second, if you’re running Betelim, any skill that doesn’t consume a Stain zeroes out your damage stack immediately [3] — there’s no partial credit for a near-miss.

Is this loop still correct after the Thermal Transfer changes?
Yes. Patch 1.4.0 fixed Thermal Transfer so it only grants Lune an extra turn when its Stain-consumption requirement is actually met, rather than firing automatically [7][8]. That patch didn’t touch Earth Rising, Ice Lance, Immolation, or Electrify — the four-skill loop in this guide is unaffected and current as of Patch 1.5.6.

If you’re weighing whether Expedition 33’s turn-based combat is worth your time next to faster-paced combat systems, our 20 Best Action RPGs of 2026 roundup covers the genre it deliberately isn’t. And if turn-based tactics are exactly what you’re after, our BG3 vs DOS2 breakdown compares the two biggest names already in your backlog.

Sources

Verified against Patch 1.4.0 (July 30, 2025) and current through Patch 1.5.6 (June 30, 2026, no further Lune balance changes) [7][8]. Values may change with future updates.

1. Lune Skills Guide — Maxroll.gg
2. Lune — Expedition 33 Wiki (Fextralife)
3. Betelim — Expedition 33 Wiki (Fextralife)
4. Lune Best Builds and Attributes — Game8
5. A Beginner’s Guide To Mastering Lune — Kotaku
6. The Best Way To Build Lune — TheGamer
7. Patch Notes — Expedition 33 Wiki (Fextralife)
8. Patch Notes — Expedition33.com (official)

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.