add_highest_skill_five_points_effect

add_highest_skill_five_points_effect = {
	switch = {
		trigger = highest_skill_including_prowess
		diplomacy = { add_diplomacy_skill = 5 }
		intrigue = { add_intrigue_skill = 5 }
		learning = { add_learning_skill = 5 }
		martial = { add_martial_skill = 5 }
		stewardship = { add_stewardship_skill = 5 }
		prowess = { add_prowess_skill = 5 }
	}
}

As written in game/common/scripted_effects/00_skill_effects.txt.