[Radek]

What have you given to the lich? The needed relic is the Holy Relic, which is in the chest in the wall on the "bridge" over the lava pool in the north part of the dungeon. It looks like a strange ankh (it is not an ankh).

Caveat! You can give anything to any NPC, even if you are trying to give a wrong item! The NPC will take it and say "Oh, thank you!" or something similar - and the item is lost. Sometimes you can steal the wrong item back, sometimes you cannot.
Annoying? Yes, but we can't do anything with it.