Crystalliser
An amalgam of shards left behind from exploded End Crystals. After gaining sapience, you've retained a similar level of strength.
The Crystalliser alternates between playing as a bruiser and a glass cannon. Crystal Shards can be expended to regain health, allowing the Crystalliser to last longer in a fight, despite their low base health; alternatively, expending a full bar of Crystal Shards allows the Crystalliser to highly vulnerable in exchange for dealing large amounts of damage.
The 75% damage reduction to explosions also enable a double-entendre of Crystal PvP.
See the power list here.