If you will use crystal heart on top of failed champion arena, you will take damage. Is his hitbox revealed? Can you use grubberfly elegy or staff like flukemarm to cheese him? :
How to cheese the first Dream Boss in Hollow Knight — Steemit
Failed champion fast cheese (using old nail to prove a point) : r/ HollowKnight
you got any cheese for this guy? I'm done trying : r/HollowKnight
How to beat Failed Champion (Radiant) | Hollow Knight - YouTube
Hollow Knight Bosses Ranked by Difficulty - The Punished Backlog
How to cheese Failed Champion/Lost Kin in Hollow Knight - YouTube
Failed champion is a nightmare... those boulders make everything so much worse honestly. : r/HollowKnight
How Many Hollow Knight Bosses Can You Cheese? دیدئو dideo
How to cheese the first Dream Boss in Hollow Knight — Steemit
How to cheese the first Dream Boss in Hollow Knight — Steemit