During your turn, increases your Creatures' base ATK by 100%. If this Creature has less HP than the enemy Creature in front of it, it gains Life Sap 10 and all your Creatures gain an additional 100% ATK. Effect lasts for 1 Rounds.
Pre Patch 10.8 from May 25th 2017: During your turn, increases your Creatures' base ATK by 50% for 1 Round. If your Creature has less HP than the adjacent enemy Creature, your Creature's ATK increases by an additional 50%.