hi,
Putting the amulet as a requirement to the slayer quest would be deeply unfair, as those who chose to kill liam cannot do the quest, and therefore cannot get the amulet. I also have an idea. I think that the amulet should be guarded by swarms of undead. As soon as the amulet is picked up, swarms of undead should attack the player, similar to the goblin king in the arena. There should be at least 3 waves. That way, the quest will be extremely difficult to complete. An evil spell, by allowing the amulet to remain broken would also be nice. One other thing, blessed peace becomes woefully inaffective at the higher levels, around 60-70. Also, I think summon undead should scale with level, to summon spectral or skeletal dragons at higher levels.