Is the Bone Fist you found in the Ivory King DLC as OP as people are saying? Let's take a look.
0:01 - Part 1: Complete Move Set 2:40 - Part 2: PvE Demonstration (Heide's Tower of Flame) 6:00 - Part 3: PvP Demonstration (AKA Getting my butt whooped) 12:50 - Part 4: Overall Impressions of the Bone Fist weapon.
Where can you find the Bone Fist? In the Ivory King DLC, in Frozen Eleum Loyce, in the area accessed by lighting the four torches after thawing the ice, there is a secret wall on the left with a corpse- The Bone Fist is on the corpse.
To get a 2nd Bone Fist, either put down your summon sign in the Frigid Outskirts (with a Gold Serpent Ring on to increase drops) and kill the Ice Stallions. I got one after about 3-4 horses.
Alternately, you can burn a bonfire ascetic at the Outer Wall Bonfire.