There is a strange graphic glitch on insanity which causes a fail in the last wave. a lonely knight stays alive on the left side of the defence team.
Maybe his passive /talismans stays alive?
https://forum.ironmaidenlegacy.com/i...AAAElFTkSuQmCC
https://forum.ironmaidenlegacy.com/a...2&d=1609760601
FIX THIS GAME!!!