Berserk

Level	Effect
I	Grapple & Thrash: User’s Melee Attack gains Knockdown.
II	Onslaught: User’s Melee Attack gains Sweep.
III	Limb Fracture: User’s Melee Attack gains Crippling.
IV	Mortal Wound: User’s Melee Attack gains Cleave.

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Source: Eldfall Chronicles Rulebook v1.6, p. 75.