Matchups
Which damage each enemy is weak to, resists or is immune to, and which weapons deal it. 77 of 96 enemies have a tag; the rest take every damage type normally.
The game files only say which damage types apply. The multipliers live in game code, so there are no percentages here, and none are guessed.
W weak R resists I immune
Weapons by damage type
Acid 2 weapons
Coating: Acid Coating (+25%)
Bleeding 0 weapons
No melee or ranged weapon deals this directly.
Blunt 24 weapons
Bullet 25 weapons
Bullet (shotgun pellet) 7 weapons
Bullet (small) 7 weapons
Cold 0 weapons
No melee or ranged weapon deals this directly.
Electricity 1 weapon
Coating: Electromagnetic Coating (+5%)
Explosive 1 weapon
Explosive (defense bot) 0 weapons
No melee or ranged weapon deals this directly.
Explosive (Jotun) 0 weapons
No melee or ranged weapon deals this directly.
Fire 6 weapons
Coating: Thermal Coating (+15%)
Holy 1 weapon
Laser 8 weapons
Sharp 36 weapons
X-Ray Field 0 weapons
No melee or ranged weapon deals this directly.
No damage tag in the game data (no weakness or resistance applies): Fishing Rod, Hypercross Magbow, Industrial Crossbow, Insulated Rod, Lodestone Crossbow, M.O.P. 9000, Magbow, Makeshift Crossbow, Net Launcher, Quill Rifle.