The boss can be set at any time during Hardmode but I was thinking after Skeletron Prime.
Encountered underground.
Boss is activated when you kill a special, different looking, more sinister Mimic. (Maybe a a 1/150 chance of appearing? Or you throw/splash a special potion or material onto it...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.