SKULBUILD
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Achievements

The Skeleton King

Bosses

Unlock condition

Site text · review not recorded

Have the starting skull Skul active when the First Hero dies in normal mode.

Practical tip

Site text · review not recorded

Keep Skul in the spare slot and swap before the final kill. You do not have to use Skul throughout the run; the Dark Mirror boss uses a different check.

Steam official list · 2026-09-06

About site text

Game wording, site translations and explanations are kept distinct. Site text in every language is subject to review. AI review is not human review; unrecorded checks remain unknown.