The Hammer of Thag is special, unlike the other two Thag weapons, it has only a 1% drop rate. Combined with Thag’s 1-hour respawn, that makes it the rarest weapon drop in the game.
But its stats are a joke. They weren’t even buffed with the Age of War like most legendary weapons.
Prior to AoW, it had 65 damage, post-AoW, it is 65 light/65 heavy. The exact same and no unique status effects added.
If a weapon is as rare as the Hammer of Thag, then it should be worth getting.
While the Mace of Thag is not quite as rare as the Hammer, it received basically the same treatment.
Prior to AoW, it had 48 damage, post-AoW, it is 46 light/50 heavy with no unique effects.