get_lowest_skill_effect

get_lowest_skill_effect = {
	save_scope_value_as = {
		name = lowest_character_skill
		value = flag:diplomacy
	}
	save_scope_value_as = {
		name = lowest_character_skill_value
		value = diplomacy
	}
	#Let's make it a bit more random in case you have the same level in a lot of skills
	random_list = {
		10 = {
			if = {
				limit = {
					martial <= scope:lowest_character_skill_value
				}
				calculate_lowest_skill_effect = { SKILL = martial }	
			}
			if = {
				limit = {
					stewardship <= scope:lowest_character_skill_value
				}
				calculate_lowest_skill_effect = { SKILL = stewardship }	
			}
			if = {
				limit = {
					intrigue <= scope:lowest_character_skill_value
				}
				calculate_lowest_skill_effect = { SKILL = intrigue }	
			}
			if = {
				limit = {
					learning <= scope:lowest_character_skill_value
				}
				calculate_lowest_skill_effect = { SKILL = learning }	
			}
		}
		10 = {
			if = {
				limit = {
					stewardship <= scope:lowest_character_skill_value
				}
				calculate_lowest_skill_effect = { SKILL = stewardship }	
			}
			if = {
				limit = {
					intrigue <= scope:lowest_character_skill_value
				}
				calculate_lowest_skill_effect = { SKILL = intrigue }	
			}
			if = {
				limit = {
					learning <= scope:lowest_character_skill_value
				}
				calculate_lowest_skill_effect = { SKILL = learning }	
			}
			if = {
				limit = {
					martial <= scope:lowest_character_skill_value
				}
				calculate_lowest_skill_effect = { SKILL = martial }	
			}
		}
		10 = {
			if = {
				limit = {
					intrigue <= scope:lowest_character_skill_value
				}
				calculate_lowest_skill_effect = { SKILL = intrigue }	
			}
			if = {
				limit = {
					learning <= scope:lowest_character_skill_value
				}
				calculate_lowest_skill_effect = { SKILL = learning }	
			}
			if = {
				limit = {
					martial <= scope:lowest_character_skill_value
				}
				calculate_lowest_skill_effect = { SKILL = martial }	
			}
			if = {
				limit = {
					stewardship <= scope:lowest_character_skill_value
				}
				calculate_lowest_skill_effect = { SKILL = stewardship }	
			}
		}
		10 = {
			if = {
				limit = {
					learning <= scope:lowest_character_skill_value
				}
				calculate_lowest_skill_effect = { SKILL = learning }	
			}
			if = {
				limit = {
					martial <= scope:lowest_character_skill_value
				}
				calculate_lowest_skill_effect = { SKILL = martial }	
			}
			if = {
				limit = {
					stewardship <= scope:lowest_character_skill_value
				}
				calculate_lowest_skill_effect = { SKILL = stewardship }	
			}
			if = {
				limit = {
					intrigue <= scope:lowest_character_skill_value
				}
				calculate_lowest_skill_effect = { SKILL = intrigue }	
			}
		}
	}
}

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