Here’s how to find one of the best hammers in Shadow Of The Erdtree
Once you enter Taylew’s Ruined Forge and activate the Site of Grace inside, descend deeper until you reach a platform overlooking a swirling magma lake.
Veer to your left down the side passageway, watch out for the magma ooze, and keep hiking in that general direction. You’re going to end up descending down a ladder and hopping across several platforms until you make it to a large fallen pipe that leads down into the magma. Carefully leap onto the pipe and across to the other side to find yourself in a new area with another magma ooze. Once you make short work of this blob, loot the corpse behind it to find the hammer.