First, unlock the "Warrior Ability: Overpower Attacks" and "Hunter Ability: Overpower Bow Strike" skills. Only the first tier of the skills are required. Once you have the skills, press R1 + R2 to perform an overpower attack (consumes three full adrenaline segments). Do this with the following weapon types to get the "I Have The Power" trophy: Sword, Dagger, Heavy Blunt, Heavy Bladed, Staff, Spear, Bow (requires "Overpower Bow Strike" skill). Note: There is also a Bare-Handed takedown when you unequip the weapons from inventory, but it is not required for this trophy.