Fat Molded (mine)

Chapter: 7 · Swamp · Salt Mines
Where: Salt Mine B1, Abandoned Mine: a wide cavern with crates and a central steel structure

Weak point

The head (small HP pool); body shots barely hurt

When you drop off the stairs (there is no way back), 2 Fat Molded appear at the far end, behind a large structure. It is the only campaign fight whose HP changes with difficulty: on Easy and Normal they have 3500 and 9000 HP. Remote Bombs are the star tool: plant them while they spawn.

Reward

The ladder to the Exit Passage: the last tape recorder, the Mine Map, Machine Gun Ammo ×150 and 1 Strong First Aid Med.

Easy and Normal: 3500 and 9000 HP (datamined). Madhouse: 14,000 and 24,000 HP, faster, plus 3 tripwire C4 charges on the ladder that you must shoot before you can climb. Stun both together with Neuro Rounds, shoot the charges, stun them again and climb.

Step by step

Run up while they spawn, plant a Remote Bomb (ZR) near them, lead them around the pillar and detonate it (Y).
Otherwise circle the central steel structure and use the crates as cover from the vomit streams; step out to shotgun their faces.
Neuro Rounds from the Grenade Launcher stun them: follow up with Enhanced Handgun Ammo to the head.
If one grabs you while a Remote Bomb is equipped, press ZR: the bomb goes into its mouth and kills it instantly.
They explode on death: step away or block.
Arena loot (Normal): First Aid Med on a rock (SE), Machine Gun Ammo ×20 (crate, SE), Strong First Aid Med (crate, west), Burner Fuel ×40 (crate, NW) and a Herb (crate, north).