Warp Spasm

Were you cursed by an insane Wizard or Fae creature, "blessed" by a demon of the Abyss, or  do you simply have some latent troll blood?

No matter the origin of your powers, one thing is for certain.

When you enter your rage your body becomes wracked by thousands of tiny spasms that cause your skin to tear and your muscles to grow at and shift unnaturally.

Monstrous Spasm

At 3rd level, your rage warps your body into a monstrous form.

When you enter your rage your size doubles in all dimensions, and your weight is multiplied by eight. This growth increases your size by one category-- from Medium to Large, for example. If there isn't enough room for you to double your size, you attain the maximum possible size in the space available. Your weapons do not grow with you, instead when you wield a versatile weapon in one hand you treat it as though you are wielding it with two and, if you become large with this feature you can wield a 2 handed weapon in only your main hand without penalty.

Monstrous Impulse

Your rage fuelled madness takes over, driving you to terrible savagery.

While you are raging and have a free hand, when you Make a melee weapon attack, my may attempt to grapple the target as a bonus action.

 

While you are Raging,  Grappled Creatures that are up to two size categories smaller then you can be used as improvised melee weapons, dealing 2d4 bludgeoning damage to both the target and grappled Creature on a successful hit, tiny creatures used as improvised weapons do half damage.

at 6th level, creatures grappled by you that are up to two size categories smaller then you can be used as an improvised ranged weapon with a range of 40ft and now deal 2d6 bludgeoning damage.

at 10th level the damage dealt by grappled creatures used as weapons increases to 2d8, and at 15th level it is increased again to 2d10.

Horrific Transformation

Witnessing the transformation induced by your rage causes panic and soiled britches. 

When you enter your rage, all creatures that can see you within 40ft must make a wisdom saving throw (DC= 8 + Proficiency Bonus + Con Modifier) or be frightened of you.

A Frightened creature must make a wisdom saving throw at the end of its turn to end this effect. 

Warped Strength

The Warp Spasm grants you the power to topple walls and crush boulders

While you are raging, your attacks do double damage to buildings.

Also, while you are raging,  any creature grappled by you has disadvantage on athletics(strength)and acrobatics(dexterity)  checks made to escape the grapple and takes 1d10 bludgeoning damage for each round that is remains in your grasp.

Riastrad

Your warp spasm is forcing you body through a constant stream of mutations and mutilations, old wounds close as easily as new ones open.

While you are raging, you gain regeneration equal to 1/2 of your total level + you Constitution modifier.