Beast of Reincarnation Bosses: The Steam-Confirmed Roster
Every boss name below comes from official Steam achievement data for App 2001760, with the global unlock rate recorded on 8 September 2026. The six Nushi regional bosses form a clear progression ladder; three paired or co-op combat entries sit alongside them. Fight tactics are only published for encounters this site has verified against the released build.
The six Nushi regional bosses
Nushi are the major regional boss encounters. The unlock-rate ladder is the only population data Valve publishes: it shows how many players beat each Nushi, not its health or difficulty.
| Boss | Achievement | Global unlock | What is verified |
|---|---|---|---|
| Rangifer | Rangifer's End | 53.5% | Fought twice: crater fight (level 9, one stage) and sealed-lair rematch (level 12, two stages). Weak to fire in both. |
| Lacerta | Lacerta's End | 43.8% | The biggest attrition step in the game: roughly one in five players who beat Rangifer stop before Lacerta. The Thunderwave Sword note covers its Steam-reported electric weakness. |
| Taurus | Taurus's End | 34.8% | Named in Steam achievement data. No verified route published on this site yet. |
| Corvus | Corvus's End | 28.3% | Named in Steam achievement data. No verified route published on this site yet. |
| Ursa | Ursa's End | 25.0% | Within half a point of Erymanth, which suggests the two are available in either order rather than strictly sequential. |
| Erymanth | Erymanth's End | 24.6% | The least-unlocked of the six Nushi in the Steam global snapshot. |
Other combat achievements naming encounters
| Entry | Achievement | Global unlock | Boundary |
|---|---|---|---|
| Koo de Grace | Koo de Grace | 25.6% | A co-op finisher achievement listed among the combat entries; the site does not claim it is a conventional boss fight. |
| Shidou & Nue | Shidou & Nue | 24.8% | Paired boss achievement naming two encounters in one entry. |
| Kunai & Kirin | Kunai & Kirin | 24.5% | Paired boss achievement naming two encounters in one entry. |
| Horror in the Sky | Horror in the Sky | 18.3% | Non-Nushi combat achievement; tracked on the Wasteland Colossal page. |
| The Sealer | The Sealer | 21.5% | Non-Nushi combat achievement outside the Nushi set. |
Verified boss guides
What this page does not claim
A complete public roster, exact health values, universal level recommendations and full reward tables are not established for the unnamed Nushi. This site publishes tactics for an encounter only after its name, location, weakness and attack behaviour can be checked against the released build — so Lacerta, Taurus, Corvus, Ursa and Erymanth appear here as official names with official unlock rates, and nothing more.