Dark Forretress

It stays motionless in trees, driving away with flying armored shards from its hard shell any who come close.

Armor Up: Until the end of your next turn, if Dark Forretress would be Knocked Out by damage from an attack, flip a coin. If heads, Dark Forretress is not Knocked Out and its remaining HP become 10 instead.

Explosion (60): Dark Forretress does 60 damage to itself.