When attacking Sunken Temple with Cleave, if a unit only has mighty from Assault +3, does it trigger Sunken Temple's conquer ability?

Ruling: No, Assault bonus might goes away along with the attacker designation just before conquering happens. If you don't have any units who are mighty without their Assault bonus might, Sunken Temple won't trigger.

Sequence:

• Unit attacks with Assault bonus might
• Attacker designation is removed
• Assault bonus might is lost (since it requires attacker designation)
• Conquering happens and conquer abilities check for mighty units
• Sunken Temple only triggers if units are mighty at this point