Grossir

Grossir is a fel-corrupted sea giant located at the Felrage Strand on the Broken Shore.

Abilities

 * Caustic Burst - Targets an area in front of the caster, causing Fel to burst through the earth, inflicting Fire damage on impact.
 * Molten Chaos - Throws a glob of molten Fel at an enemy, immediately inflicting Fire damage to all enemies within 0 yards and setting those enemies ablaze for 6 sec.

Speculation
As he is fel-corrupted, he apparently assisted the Deepsurge naga who were later transformed into Felsurge.