Into the Pit (Special Attack): Buffs team +ATK and Banishes target enemy, purging all Buffs and rendering them inactive for 2 turns, then returning them to the dungeon at 50% of their current HP (Epic Bosses cannot be Banished). Banished enemies count as being defeated when no other enemies are active. Starts Powered.
Constructs heroes are immune to the Banished debuff. Boss enemies in Boss Invasion events and Age of Chaos dungeons are completely immune to Banished and don't suffer the health loss. No animation is played either.
Protections buffs like Shrouded and Dragon Scales which grant immunity to debuffs for a few turns, also prevent the Banished effect.