friendly_counsel_random_removal_effect

friendly_counsel_random_removal_effect = {
	if = {
		limit = {
			has_perk = friendly_counsel_perk
		}

		every_relation = {
			type = friend
			add_to_temporary_list = friendly_counsel_friends
		}
		every_relation = {
			type = best_friend
			add_to_temporary_list = friendly_counsel_friends
		}

		if = {
			limit = {
				exists = var:current_friendly_counsel_perk_value
				save_temporary_scope_as = affected_friend
				var:current_friendly_counsel_perk_value <= friendly_counsel_max
				var:current_friendly_counsel_perk_value > 0
				any_in_list = {
					list = friendly_counsel_friends
					count > scope:affected_friend.var:current_friendly_counsel_perk_value
					NOT = { has_character_flag = about_to_die_but_not_dead_yet_flag  }
				}
			}
			random_list = {
				1 = {
					trigger = {
						has_character_modifier = friendly_counsel_martial_gain
					}
					remove_character_modifier = friendly_counsel_martial_gain
				}
				1 = {
					trigger = {
						has_character_modifier = friendly_counsel_diplomacy_gain
					}
					remove_character_modifier = friendly_counsel_diplomacy_gain
				}
				1 = {
					trigger = {
						has_character_modifier = friendly_counsel_intrigue_gain
					}
					remove_character_modifier = friendly_counsel_intrigue_gain
				}
				1 = {
					trigger = {
						has_character_modifier = friendly_counsel_stewardship_gain
					}
					remove_character_modifier = friendly_counsel_stewardship_gain
				}
				1 = {
					trigger = {
						has_character_modifier = friendly_counsel_learning_gain
					}
					remove_character_modifier = friendly_counsel_learning_gain
				}
			}

			change_variable = {
				name = current_friendly_counsel_perk_value
				subtract = 1
			}
		}
	}
}

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