Swamp Slug

Armor Class 14 · Hit Points 175 (14d12 + 84) · Speed 20 ft., swim 40 ft.

Vile Stench (Trait). Any creature that starts its turn within 10 feet of the slug must succeed on a DC 15 Constitution saving throw or take 9 (2d8) poison damage.

Hold Breath (Trait). The slug can hold its breath for 1 hour.

Multiattack (Action). The slug makes one bite attack and one slam attack.

Bite (Action). Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 17 (2d10 + 6) kinetic damage, and the target is grappled (escape DC 18). Until this grapple ends, the target is restrained, and the slug can't bite another target.

Slam (Action). Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 22 (3d10 + 6) kinetic damage.

Swallow (Action). If the slug dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 5 feet of movement, exiting prone. The slug makes one bite attack against a Medium or smaller target it is grappling. If the attack hits, the target is swallowed, and the grapple ends. The swallowed target is blinded and restrained, it has total cover against attacks and other effects outside the slug, and it takes 7 (2d6) kinetic damage plus 7 (2d6) acid damage at the start of each of the slug's turns. The slug can have only one target swallowed at a time.