Kunai and Kirin fight you twice — a scripted-loss encounter in Chapter 8, then the real fight in Chapter 12 — and confusing which one actually matters is the first way players waste resources on this duo. The second way is more expensive: treating two bosses as two separate fights happening at once, splitting damage between whichever target looks open instead of committing to one. Neither mistake is your fault exactly — nothing in-game tells you the first encounter is unwinnable by design, or that this fight specifically punishes divided attention harder than most single-boss encounters do. Both bosses share one weakness, Poison, and once you stop treating this as two fights, that shared weakness turns a genuinely long dual-boss encounter into a manageable one.
Quick Start: Beat the Duo in 5 Steps
- Craft or buy Poison Arrows and Poison Bolts before either encounter. Kunai and Kirin share the same weakness — Poison — so this one loadout swap does double duty for both bosses [2][3].
- Pick one target and stay on it. Splitting damage between both bosses is the single most common way this fight goes long [2][4].
- Learn the red flash on Kirin’s missile barrage. It’s the one attack in this fight that can’t be parried — everything else in the encounter has a parry window [2].
- Don’t sweat the first encounter. Chapter 8’s fight against Kunai and Kirin Malefact is a scripted loss — the story moves on whether you win or not, and there’s nothing to farm from it [2].
- Bring an Antidote or Poison-resist item. Kirin’s Mud Pounce leaves patches that slow Emma, and getting chip-damaged while stuck in one compounds fast [2].
Kunai and Kirin at a Glance
| Encounter | Zone | Level | Shared Weakness | Key Mechanic | Reward |
|---|---|---|---|---|---|
| 1st fight (Ch. 8) | Wasteland, Crater Zone | 45 | Poison | Scripted loss — outcome doesn’t matter | None |
| Rematch (Ch. 12) | Capital Zone | 49 | Poison | Real fight — single-target focus decides it | Kirin Memories, Blade Art: Thunder, Numasugi: Skewer |
When NOT to attempt the rematch: below level 49 with no Poison-element gear crafted, or without an Antidote in your loadout for Kirin’s Mud Pounce follow-up [2][4].
Why Splitting Damage Loses This Fight
Every dual-boss encounter in Beast of Reincarnation tempts the same mistake: treat it like two separate fights happening at once, and chip away at whichever boss is closer. Kunai and Kirin punish that instinct specifically. Both guides that break the fight down move-by-move agree on the fix — pick one target, commit, and ignore the second boss until the first is down [2][4]. The reasoning is mechanical, not just a difficulty tip: every parry you land builds both your own Blade Art meter and Koo’s Florescence Points at once, the same shared resource covered in our parry-timing breakdown [2]. Split your attention between two bosses and you’re not just taking more hits — you’re halving how fast either boss’s Down Gauge fills, which means fewer stagger windows for Blade Art punishes across the whole fight, not just a slower kill on paper.
The site’s established rule still applies here: any attack that flashes red mid-wind-up cannot be parried, full stop — dodge it instead. Kirin’s missile barrage is the one attack in this encounter that carries that tell, and it hits hard enough that eating it while mid-combo on Kunai is usually the actual reason a “should be manageable” attempt turns into a wipe [2]. Everything else either boss throws — Kunai’s slash combos, Kirin’s water beams and rushes — has a genuine parry window, which is unusual for a dual-boss fight built around forcing you to split attention [2][3].
Parry, Dodge, or Retreat: The Decision Tree
With two bosses throwing overlapping attacks, hesitating for even a half-second to figure out the right response is usually worse than picking wrong fast. Run through this order every time an attack starts:
- Does it flash red? Dodge, don’t parry — this covers Kunai’s Electric Discharge and Kirin’s Missile Launch, the only two hard gates in the fight [2].
- Is it a pillar-assisted or charge-up move (Kunai’s Blight Lunge)? Don’t try to interrupt it. Reposition and wait it out, then punish once she recovers [2].
- Is it a standard swing, beam, or rush with a visible wind-up? Parry it. This is most of both bosses’ kits, and every clean parry is FP and Blade Art meter you’re not getting any other way [2][3].
- Did you just land a hit on either boss? Dodge immediately after instead of following up — both Kunai and Kirin counterattack careless follow-up swings [2].
Kunai: The Fast, Punishable Half
Kunai is the melee half of the pair, and her kit rewards the same parry discipline the rest of the game has been teaching since Rangifer. Her Two Slashes and airborne Triple Lightning Slash are both straightforward parry or side-dodge windows, and her extended Greatsword Spin — two full rotations plus an overhead finisher — stays punishable even though the animation reads as “back off and wait” [2]. Two of her moves break that pattern and need memorizing on sight: Blight Lunge, a pillar-assisted downward strike that can’t be interrupted during its charge-up and can’t be parried on the hit itself, and Electric Discharge, an unblockable explosion that only gives you a clean out if you start dodging backward the instant the wind-up begins [2]. Kunai also mirrors your own aggression — land hits on her without variety and she starts counterattacking the way Emma does, which is where Koo’s status-application Bloom Arts earn their keep, since a stun interrupts the counter loop before it starts [2].
Gear check before you engage Kunai: Poison-element weapon or arrows, and — per the wiki’s specific recommendation — Koo’s Higanbana: Roots paired with Mod: Rapid Cooling to physically restrain her mid-fight, which buys a clean punish window without needing a perfect parry read [3].
Kirin Malefact: The Ranged Half
Kirin fights at range first and up close second, and that ordering is what trips up players who cleared Kunai’s kit and assume the same rhythm carries over. Its Water Beam and the follow-up Water Spin both stay parryable — the spin actually opens two separate parry windows, and Koo can land free hits during the rotation if he’s not busy elsewhere [2]. Rush and Triple Rush are horn-charged closing attacks, each individually parryable even when chained three times in a row, so don’t panic and dodge-spam the whole sequence [2]. The one attack that breaks from this pattern is the Missile Launch: a short-range projectile barrage preceded by the game’s standard red-flash tell, and the fix is distance, not timing — start moving away the moment you see the flash rather than trying to read individual missiles [2].
Kirin’s Mud Pounce is the fight’s best punish opportunity once you know it’s coming. The mud patch slows Emma first, then Kirin pounces with root sprouts — but the pounce itself is parryable, and landing that parry opens what more than one guide calls the safest counterattack window in the whole encounter [2][4]. Its Rooted Counterattack, like Kunai’s counter, responds to careless melee pressure, so dodge immediately after your own hit lands rather than following up with a second swing on reflex.
The Chapter 8 Loss You’re Allowed to Take
Here’s the detail most players don’t find out until after they’ve already burned consumables trying to win a fight the game never intended them to win: the first Kunai and Kirin encounter, in Chapter 8, is a scripted loss [2]. The story advances the same way regardless of the outcome, and there’s no reward tied to actually beating it — nothing listed drops, no Blade Art, no material [2]. If you’re under-leveled at 45, low on Poison ammo, or just want to see the story beat, losing on purpose costs you nothing you’d have gotten from winning.
That doesn’t mean the Chapter 8 fight is worthless to engage with, though. It’s the only chance to see both bosses’ openers before the level-49 rematch actually matters, and every attack tell you bank now — Kunai’s Blight Lunge pillar, Kirin’s red-flash missile timing — carries straight into Chapter 12. None of the sourced guides describe a different moveset for the rematch, just the higher level and the fact that this time it counts [2][3]. Treat the first fight as a free scouting run, not a real attempt, and save your Antidotes and Poison ammo for the rematch where they actually matter.
Poison Loadout: What to Bring to the Rematch
| Item | Why It’s Here |
|---|---|
| Poison Arrows / Poison Bolts | Both bosses share the Poison weakness — this is the single highest-value gear swap for the fight [2][3] |
| Hunter’s Sword | Wiki-specific pick, called out as effective against both Kunai and Kirin by name rather than just “any Poison weapon” [3] |
| Antidote or Poison-resist accessory | Kirin’s Mud Pounce slows you into follow-up chip damage; getting Poisoned mid-slow compounds a bad position fast [2] |
| Koo’s Higanbana: Roots + Mod: Rapid Cooling | Restrains Kunai mid-fight for a clean punish window without needing a perfect parry read [3] |
Priorities by Player Type
| Player Type | Priority |
|---|---|
| New player | Use the Chapter 8 fight as a free scouting run — don’t burn consumables trying to win a fight with no reward. Focus on learning Kirin’s red-flash tell before Chapter 12. |
| Casual player | Craft the Poison loadout once, before the rematch, and commit to single-target focus on Kunai first — her kit punishes counterattacks less punishingly than Kirin’s ranged pressure while you’re still learning the fight. |
| Hardcore / optimizer | Chase Kirin’s Mud Pounce parry deliberately — it’s the fight’s highest-value punish window — and rotate Koo’s Bloom Arts to keep stun pressure on Kunai’s counterattack loop instead of just tanking it. |
| Completionist | Clear the Chapter 12 rematch for Kirin Memories, Blade Art: Thunder, and Numasugi: Skewer, then check in with the Cleanse Walker NPC afterward — the wiki lists the Camellia weapon as a separate post-victory pickup from them, on top of the fight’s own drops. |
Verified against Beast of Reincarnation patch 1.0.7 (Aug. 10, 2026), which applied unspecified balance adjustments to bosses across all difficulty levels and tuned Emma’s parry window when taking damage — no boss was individually itemized in the patch notes, so exact numeric changes to Kunai or Kirin’s windows are unconfirmed [5]. Attack patterns and tells should still hold; recheck if a future patch calls this fight out by name.
FAQ
Should I actually try to win the Chapter 8 fight?
No — there’s no reward for it and the story continues the same way whether you win or lose [2]. The only reason to engage seriously at all is to bank attack-tell recognition for the Chapter 12 rematch, where winning actually matters. Burning consumables here is pure waste.
Is Kirin’s missile attack really unparryable, or can it be blocked with the right timing?
Every red-flash attack in this game is a hard dodge-only gate, not a tight parry window — the same rule that applies to Kunai’s Electric Discharge and every other red-flash tell in the game applies here [2]. Guides that describe Kirin as mostly parryable are talking about its kit as a whole, not this specific attack; treat the missile barrage as the one confirmed exception.
Do I need Poison gear for both fights, or just the rematch?
Save it for the rematch. The Chapter 8 fight is unwinnable by design, so there’s no benefit to using consumables you’ll want for Chapter 12, where the Poison weakness actually shortens a fight that otherwise runs long on two full boss health pools [2][3].
What’s the single biggest mistake in this fight?
Splitting damage between both bosses instead of committing to one target. It doesn’t just take longer — it halves how fast either boss’s stagger meter fills, which costs you Blade Art punish windows across the entire fight, not just a slower kill [2][4].
New to this fight entirely? Start with our Beast of Reincarnation complete guide for the parry loop, Koo’s commands, and beginner priorities. For the earlier Nushi that teach the same fundamentals, see our Rangifer and Lacerta boss guide.
Sources
- Beast of Reincarnation — Wikipedia
- How to Beat Kunai and Kirin — Game8
- Kunai and Kirin — Beast of Reincarnation Wiki (Fextralife)
- Beast of Reincarnation All Boss Locations and Tips — oslink.io
- Beast of Reincarnation Update 1.0.7 Patch Notes — RPG Site
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.