give_random_commander_trait_effect

give_random_commander_trait_effect = {
	random_list = {
		100 = {
			trigger = { NOT = { has_trait = logistician } }
			add_trait = logistician
		}
		100 = {
			trigger = { NOT = { has_trait = military_engineer } }
			add_trait = military_engineer
		}
		100 = {
			trigger = { NOT = { has_trait = aggressive_attacker } }
			add_trait = aggressive_attacker
		}
		100 = {
			trigger = { NOT = { has_trait = unyielding_defender } }
			add_trait = unyielding_defender
		}
		100 = {
			trigger = { NOT = { has_trait = forder } }
			add_trait = forder
		}
		100 = {
			trigger = { NOT = { has_trait = flexible_leader } }
			add_trait = flexible_leader
		}
		100 = {
			trigger = {
				NOT = { has_trait = desert_warrior }
				any_sub_realm_barony = {
					title_province = {
						OR = {
							terrain = desert
							terrain = desert_mountains
							terrain = oasis
							terrain = drylands
						}
					}
				}
			}
			add_trait = desert_warrior
		}
		100 = {
			trigger = {
				NOT = { has_trait = jungle_stalker }
				any_sub_realm_barony = {
					title_province = {
						terrain = jungle
					}
				}
			}
			add_trait = jungle_stalker
		}
		100 = {
			trigger = {
				NOT = { has_trait = winter_soldier }
				any_sub_realm_barony = {
					title_province = {
						OR = {
							terrain = taiga
							geographical_region = world_tibet
							geographical_region = world_europe_north
							geographical_region = world_europe_east
							geographical_region = world_steppe
						}
					}
				}
			}
			add_trait = winter_soldier
		}
		100 = {
			trigger = {
				NOT = { has_trait = forest_fighter }
				any_sub_realm_barony = {
					title_province = {
						OR = {
							terrain = forest
							terrain = taiga
						}
					}
				}
			}
			add_trait = forest_fighter
		}
		100 = {
			trigger = {
				NOT = { has_trait = open_terrain_expert }
				any_sub_realm_barony = {
					title_province = {
						OR = {
							terrain = plains
							terrain = farmlands
							terrain = steppe
						}
					}
				}
			}
			add_trait = open_terrain_expert
		}
		100 = {
			trigger = {
				NOT = { has_trait = rough_terrain_expert }
				any_sub_realm_barony = {
					title_province = {
						OR = {
							terrain = hills
							terrain = mountains
							terrain = wetlands
						}
					}
				}
			}
			add_trait = rough_terrain_expert
		}
		100 = {
			trigger = { NOT = { has_trait = reaver } }
			add_trait = reaver
		}
		100 = {
			trigger = { NOT = { has_trait = reckless } }

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