You rage with the fury of a titanic monstrosity.
Level 3
Titanic Adversary.
While you are Raging your size increases to Large or by one size category, whichever is larger. You have Advantage on STR saves and attacks when fighting a creature which is size Large or larger.
Unnatural Disaster.
Your attacks against constructs and structures deal double damage. When you attack a construct or structure roll a Fury Die.
Level 7
Walking Calamity.
When you move deal half the sum of your Fury Dice as bludgeoning damage to each creature which is adjacent to a space you occupy during that movement. Creatures affected must make a STR save or be knocked Prone.
Level 11
Titanic Adversary (2).
While you are Raging your size increases to Huge or by one size category, whichever is larger. Creatures dealt damage or knocked Prone by Walking Calamity are also Frightened until the end of their next turn.
Level 15
Titanic Adversary (3).
While you are Raging your size increases to Gargantuan. While Raging reduce damage dealt to you by creatures size Large or smaller by STR+DEX.
Cataclysmic Wrath.
5 Actions, Range 4; Expend all of your Fury Dice to deal double the sum rolled as fire or lightning damage to creatures in a 3x3 area. Creatures affected take half damage on a successful DEX save.