Sunken Temple

Yes, if [Assault] raises at least one of your conquering units to 5 or more.⁷⁰⁸⁷¹⁰ The conquer occurs before combat ends.^468.5.d468.7 The unit's attacker designation is removed only afterward, so its [Assault] bonus still applies when Sunken Temple checks whether it is [Mighty].^{468.7.a807.1.c807.1.d.1}