Envoy of Thunder has a 7.5% chance to refund a charge when it deals damage and Messenger of Wrath has a 7.5% chance to refund the stored damage when it activates.
Level Bonus: +0.3% chance
Envoy of Thunder
On kill, the tower gains 3 thunder charges. Every second, a charge is spent to strike a random enemy in attack range with a bolt of lightning that deals 50% of attack damage.
Additionally, there is a 10% chance when attacking a Boss to gain 1 thunder charge.
Level Bonus: +2% attack damage +0.4% chance vs Bosses
Messenger of Wrath
Towers within 175 have 5% of their attack damage redirected and stored. When the Herald critically hits with an attack, all stored damage is removed and added to the attack.