Rigel

Rigel casts a shield on himself. The shield can absorb up to 5,132,379 (depends on attack) damage. If destroyed or recast, the shield explodes, dealing 1,026,476 (depends on attack) damage and stunning nearby enemies for 2.6 seconds.

Available if your team has at least 2 Light Titans on the battlefield. Conjures a Supernova on the battlefield, which constricts over the course of 5 seconds. During that time, allied titans' health can't drop below 1. After that, the Supernova explodes, damaging all enemies. Explosion damage: 6,127,211.3.