Power Within in DS1 was still stronger than this Lasted 100 seconds, increased damage by 40%, and the DoT it put on you was determined by your Pyromancy gloves upgrade level, so if you used an un-upgraded one, you took basically no damage yourself
U can also be naked, use a weightless talisman like dragon and have blue fairy talisman Increases about 19% all physical DMG like dragon bite and beast spells Sacrifice a bit more weight and equipment the cinquedea for the most boost
Easily my favorite aspect of the buff, makes the 30s duration acceptable IMO. It helps promote and facilitate the aggressive approach necessary to take advantage of the buff. With Old Lord's and Turtle it becomes an extremely strong and useful all-around buff. Also one of the only buffs I don't feel like an ******* using in PvP. Applies pretty fast, you can walk for most of the cast, etc.