Does the first boss have two phases?

Unsettled, and both readings are published here. AncientDagree states flatly at 02:30 that phase one ends and phase two begins, with a tighter parry window and faster attacks. Shark R, filming the same fight, says at 02:00 that it only looks like a second phase and that he is not sure. Neither shows a transition. What is safe to act on is that the timing tightens later in the fight.

Does the first boss run away?

Yes. Shark R says it flees when first defeated and has to be fought again later. One source, uncontradicted — so a fight that ends without a kill is expected rather than broken.

How many bosses are in Beast of Reincarnation?

Not established. The two creator boss lists that exist disagree with each other — 21 entries against 22, in different orders and with different repeat counts — and one guide site publishes a roster of bosses that do not appear in the game at all. There will be no count here until there is one that can be checked.

Is the first boss called Rangifer?

Probably, and it is not confirmed. Two creators typed Rangifer into their video titles and two competitor wikis publish the same spelling, which is four independent written attestations. Nobody has been recorded saying it correctly — the captions render it "the Ringer" — and nobody has read it off the game client.

Beast of Reincarnation Boss Guide (August 2026)

§01

How far each name is from settled

This goes first because it is the part of the page most likely to be wrong. Automatic captions substitute something plausible for a proper noun they have never seen, so a name that only ever reaches us through a caption is not evidence of anything. A name a creator typed is better evidence, because they were looking at the screen while they typed it — and it is still not the game’s own text. Nothing in this table has been read off the client. Everything below cites a YouTube video id and a timestamp; the ids are listed against their creators in the sources at the foot of the page.

Name	Where it comes from	How we treat it
Rangifer — the first boss	Typed into two independent creator video titles (Xn_fm18VsFI, Y162tj75b50) and published in writing by two competitor wikis. Never pronounced correctly in any recording we hold: AncientDagree’s own commentary calls it "the Ringer" at 00:00.	The strongest boss name we have, and still unverified. We use it, and we expect it to change.
Nushi — what this class of boss seems to be called	Creator video titles, a competitor page title, and one spoken caption — Xn_fm18VsFI 00:00 reads "we’re going to take on the Nushi boss".	One spoken rendering is better than none, and it is still not the game’s text. Used as a class noun, never as a boss’s name.
Nue Malefact — the paired fight	One video title, CNo7C__2IYw. Across eight minutes its captions render the first word six different ways, none of them matching the title.	Title-only. The fight below is described without leaning on the name.
Lacerta	One video title and one chapter marker, 96JMMFPMCXM. That video has no commentary track at all — its caption file is garbled in-game barks.	The weakest name in the set. It establishes that somebody fought a boss they call Lacerta, and nothing further.
"male purifier", "the ninja"	Caption only, CNo7C__2IYw. Almost certainly a mis-hearing of something else.	Not published as a name.

Rangifer — the first boss

Where it comes from: Typed into two independent creator video titles (Xn_fm18VsFI, Y162tj75b50) and published in writing by two competitor wikis. Never pronounced correctly in any recording we hold: AncientDagree’s own commentary calls it "the Ringer" at 00:00.
How we treat it: The strongest boss name we have, and still unverified. We use it, and we expect it to change.

Nushi — what this class of boss seems to be called

Where it comes from: Creator video titles, a competitor page title, and one spoken caption — Xn_fm18VsFI 00:00 reads "we’re going to take on the Nushi boss".
How we treat it: One spoken rendering is better than none, and it is still not the game’s text. Used as a class noun, never as a boss’s name.

Nue Malefact — the paired fight

Where it comes from: One video title, CNo7C__2IYw. Across eight minutes its captions render the first word six different ways, none of them matching the title.
How we treat it: Title-only. The fight below is described without leaning on the name.

Lacerta

Where it comes from: One video title and one chapter marker, 96JMMFPMCXM. That video has no commentary track at all — its caption file is garbled in-game barks.
How we treat it: The weakest name in the set. It establishes that somebody fought a boss they call Lacerta, and nothing further.

"male purifier", "the ninja"

Where it comes from: Caption only, CNo7C__2IYw. Almost certainly a mis-hearing of something else.
How we treat it: Not published as a name.

§02

Before you start the first fight

Shark R does not walk straight into the arena. The campfire above it is marked on the map, and unlocking that campfire first is what makes the special attack available going into the fight — it is also where you upgrade before you commit to anything (Y162tj75b50 00:00–00:30).

§03

The opener is an ambush, not a charge

Wait for the boss to come to you. When a symbol appears over its head, jump-attack: Shark R reads that opener as taking around 10% of its health (Y162tj75b50 00:30–01:00). That figure is one player’s read of a bar on screen rather than a measurement, which is why it is the only damage number anywhere on this page.

§04

The loop: parry, then punish the legs

Two creators filmed this fight independently and describe the same loop, which makes it the sturdiest thing here. Parrying is not only defence — a parry denies the damage and charges Koo, so the player who parries more also has more to spend.

After a parry the boss commits to one to three head attacks. Ride them out, then hit it (Y162tj75b50 01:30).
Attack the legs. They take heavy damage and they are the easiest part of it to reach (Y162tj75b50 01:30).
The other reliable window is immediately after a perfect dodge of the stomp (Xn_fm18VsFI 00:00).
When it lowers its head to throw rocks, the projectiles can be dodged or deflected (Xn_fm18VsFI 00:00–00:30).
After a series of parries it puts its head down. That is not an opening — hold the katana and use the time to reposition or spend Koo’s abilities (Xn_fm18VsFI 00:30).
Dodge the red attacks. Do not block them (Xn_fm18VsFI 00:00).

§05

It heals, and the heal has to be interrupted

The one mechanic that turns a slow fight into an unwinnable one. AncientDagree interrupts a heal on camera and interrupts a second one later in the same fight, and both attempts carry their own chapter marker (Xn_fm18VsFI 05:00). Single source — nobody else we hold has filmed it — but it is filmed rather than inferred.

§06

It runs away the first time you beat it

Shark R states that the boss flees when first defeated and has to be fought again later (Y162tj75b50 00:00). One source, and nothing we hold contradicts it. If the fight ends without a kill, that is the fight working rather than a bug.

§07

Does it have a second phase? The two people who filmed it disagree

AncientDagree says it flatly at 02:30 — "phase one down, on to phase two" — and adds that the parry window is tighter and the attacks faster from there (Xn_fm18VsFI). Shark R, fighting the same boss, says at 02:00 that it "looks like" a second phase but that he is not sure (Y162tj75b50). Neither shows a transition anyone can point at, so we publish both readings and no phase count. The practical part holds either way: the timing does tighten later in the fight, so a parry that suddenly stops landing is the fight changing rather than your input failing.

A note for anyone checking the source rather than taking our word for it: AncientDagree’s automatic captions render that line as "the prayer window seems a little tighter". The word is parry. Quoted raw, the caption describes a mechanic this game does not have.

§08

The paired fight: focus one, and let it stagger the other for you

The only later boss anyone has filmed with commentary is a two-boss encounter (CNo7C__2IYw). Neither name in it is publishable, so the target below is simply the one the creator focuses.

Focus one of the pair completely. The other one gets handled for you (CNo7C__2IYw 02:00).
Open at range with the bow and crossbow — but stagger first. It blocks arrows while it is ready, so Koo’s abilities go in before the shots do (CNo7C__2IYw 02:00).
Do not push. Let them come to you and parry, which is also how Koo gets refilled (CNo7C__2IYw 02:00–02:30).
Using Koo’s abilities regenerates Emma’s health, so parrying is a sustain loop rather than only a defence — taking the occasional hit is affordable (CNo7C__2IYw 03:00).
At roughly half health the focused boss retreats and siphons from its partner, which fully staggers the partner for you. It happens twice across the fight (CNo7C__2IYw 03:30 and 05:00–05:30).
Watch the boss you are not fighting. It throws lightning bursts while your attention is elsewhere (CNo7C__2IYw 03:00).
Arrows and bolts run out. Plan to finish the fight on Koo’s abilities alone (CNo7C__2IYw 04:00–04:30).
Spend on the cheap abilities. Several cost five points, which is the whole bar in one go; the one- and two-point abilities can be chained (CNo7C__2IYw 07:00–07:30).
A yellow bar under the focused boss’s health fills toward a full stagger. That is the finishing window (CNo7C__2IYw 05:30–06:00).
Red flashing attacks cannot be blocked. Dodge them (CNo7C__2IYw 06:30).
The costs above are in points because the label is contested: this creator counts them in "mana points" throughout (07:00), while the combat guide cited elsewhere on this site calls the same gauge FP. One of the two is wrong and we do not know which.

§09

What is not established: the roster, the order and the levels

This is the part of a boss page everybody else fills in, and we cannot. Two creators have published complete boss lists and they do not agree: one chapters 21 entries, the other 22, in a different sequence and with different repeat counts for several bosses. Neither carries a reference for where a given fight actually sits in the game. Boss levels are published by competitor wikis with no per-claim provenance behind them, so they are not repeated here, and every spelling is in the state described at the top of this page.

And a warning about what already ranks for these searches: one site publishes a roster of "Ancient Treant, Magma Golem, Storm Roc, Abyssal Kraken, Void Lich", and assigns them Wind and Earth elements. None of those bosses exists, and the game has neither of those elements. That is not a stale page or a bad transcription — it is a boss list written without the game. It is also why this page is short.

Beast of Reincarnation Boss Guide