Take the Serpent Hole to The Ashlands. Take a right out the small cave you are transported to continue down the path until you reach the area with the three monsters hanging from the ceiling with the wire that you can jump to in the middle. Jump on the wire to the left of the monsters and continue left, grab the growth, and pull yourself up into the opening. Once in the opening, look to the right and up. You should see an orange object you can use to grab with the chain. Walk slightly further into the area after you use the chain to get to and there should be a chest with the last Wrath Shard in it.