When you return Lovis' Soulstone to him after defeating Amdusias make sure to save on the elevator when you come down. After turning the soulstone over and completing the quest you get to loot his armor chest which has a RANDOM LEGENDARY armor/weapon piece..... Just keep reloading that save you just made untill you get the piece you want/need most!
This is assuming you chose to return it to him and didnt smash it on the blood altar like the spirit asked you to do in the tower!
I chose the option to RECONSIDER when i spoke to that spirit so they wouldnt attack me along with Amdusias....