Adamastor

Spawned by trading a Trophy Shield to the ??? at D-4 in the lower valley back behind a bunch of Gigas mobs.

If you wipe he moves back to his spawn and begins to regen. Got it down to 50% before wiping and it regened to 70% then despawned.

Used Standard Gigas moves, Also had an EnSpell effect that could not be taken off by our 75 Rdm.