Mama Mold

Chapter: NaH · Not a Hero · Salt Mines and Lab
Where: Mining Work Area, Work Sector B: containers that lock you in and a truck in the middle

Weak point

Its brain, exposed after one RAMROD hit

The big white Fat Molded. You first meet it in Work Sector A (on Normal, when you lower the hanging container with the Gear and the Crank; on Professional, as soon as you enter) and there it can't be killed: it stays at 1 HP. Avoid it. The real fight is in Work Sector B with the arm bomb running: the 10-minute countdown doesn't stop. It has 50,000 HP and RAMRODs only do 4–6 times a normal bullet: use them to open it up, not to kill it.

Reward

Push the taped green crate: liquid nitrogen to take the bomb off Chris's arm.

50,000 HP (datamined). Damage on Normal: bullet 420, RAMROD 2520, Grenade 1680, Incendiary and Neuro-stun 350. It eats most of your ammo and a couple of minutes even on the lower difficulties. At the first meeting, Neuro-stun Grenades do 1000 to it but it never drops below 1 HP.

Step by step

Work Sector A (first meeting): don't shoot it. Throw a Grenade to stun it while you turn the crank, take the key and head back to the elevator.
Work Sector B: walk to the south side: containers drop, you are locked in and it appears.
Load a RAMROD into the Samurai Edge - AW Model-01 (ZL + X) and shoot it once: it loses its white invulnerability and its brain is exposed.
When it is stunned, run in and punch the weak point: big damage and knockback.
Switch to normal ammo: the Thor's Hammer - AW Model-02 shotgun, Grenades and Incendiary Grenades. A Grenade at its feet while it stands still knocks it down; punch its head while you shoot it. Don't spend more RAMRODs.
Circle the truck in the middle for cover from its flailing charge. Stay at mid range: too close and it vomits, too far and it charges. Its vomit can be blocked.
It spawns endless Little Crawlers: knife them, clear them with grenades or let them burst on their own. Loot the room during the fight.
It explodes on death: step away.