FWIW, it doesn't affect heroes, it just makes it so that anytime an OT hero is in battle (yours or an opponent's), evil enhancements get 'cannot be negated' status.
Asherah Pole
Type: Artifact • Brigade: None • Ability: None • Class: None • Special Ability: When blocking any O.T. Hero, evil enhancements cannot be negated. Discard if Gideon, King Asa, King Hezekiah, or King Josiah enters battle. • Play As: When any player is blocking an O.T. Hero, evil enhancements cannot be negated. Discard if Gideon, King Asa, King Hezekiah, or King Josiah enters battle.