Effect · every source

How to increase Heavy Infantry Toughness in CK3

8 sources raise Heavy Infantry Toughness and 1 lowers it in the game files of patch 1.20.0.3.

heavy_infantry_toughness_mult

The biggest boosts

+20%Defensive TacticsCultural tradition · Characters of this culture
+15%Hit and RunLifestyle perk
+10%Stand and FightCultural tradition · Characters of this culture

What raises Heavy Infantry Toughness (8)

Lifestyle perks (1)

Hit and Run+15%
hit_and_run_perk · game/common/lifestyle_perks/00_martial_1_strategy_tree_perks.txt

Cultural traditions (3)

Defensive Tactics+20%
Characters of this culture
tradition_mobile_guards · game/common/culture/traditions/00_maa_traditions.txt
Stand and Fight+10%
Characters of this culture
tradition_stand_and_fight · game/common/culture/traditions/00_combat_traditions.txt
Druzhina+10%
Characters of this culture
tradition_druzhina · game/common/culture/traditions/00_maa_traditions.txt

Holy sites (1)

Barlad+10%
Bârlad · Followers, while the faith holds it
barlad · game/common/religion/faith_types/00_faith_types.txt

Buildings (3)

Iron Pillar of Delhi+10%
Holder
iron-pillar-of-delhi · game/common/buildings/00_special_buildings.txt
Iron Pillar of Delhi+10%
Holder
Levels 1–4: +10% to +10% (4 levels give it)
qutb-minar · game/common/buildings/cp6_special_buildings.txt
Crown Smithies+8%
Holder · culture with Metalworkers
Levels 2–3: +5% to +8% (2 levels give it)
blacksmiths · game/common/buildings/00_duchy_capital_buildings.txt

What lowers Heavy Infantry Toughness (1)

Cultural traditions (1)

Frugal Armorers-25%
Characters of this culture
tradition_frugal_armorsmiths · game/common/culture/traditions/00_combat_traditions.txt

Source: game/common/buildings/00_duchy_capital_buildings.txt, game/common/buildings/00_special_buildings.txt, game/common/buildings/cp6_special_buildings.txt, game/common/culture/traditions/00_combat_traditions.txt, game/common/culture/traditions/00_maa_traditions.txt, game/common/lifestyle_perks/00_martial_1_strategy_tree_perks.txt, game/common/religion/faith_types/00_faith_types.txt and the English localisation, Crusader Kings III 1.20.0.3. Building chains are shown once, at their strongest level, with the range over their levels. Effects that come only from events or scale with a script value are not listed.