Drop the anvil and sack the gold to get to unburdened status before doing ToEF. Nether Bolt should make short work of the ACW (and most other inhabitants of the temple). Dipping the potions of invisibility into your unholy water will curse them. They can be used to blind the ACW then for safety.
Treasure Hunter is an absolutely immoral talent and people who take it are slaves of their lust for loot. A real character doesn't rely on worldly goodies to save the world but will do so by trusting his inner strength.