N Huge vermin
Init –4; Senses blindsight 60 ft.; Perception +0
AC 20, touch 4, flat-footed 20; (–4 Dex, +16 natural, –2 size)
hp 102 (12d8+48)
Fort +12, Ref +0, Will +4
DR 10/slashing or piercing Immune acid, mind-affecting effects
Weaknesses susceptible to salt
Speed 20 ft.
Melee tongue +15 (2d10+12 plus 2d8 acid)
Ranged spit acid +3 (10d6 acid)
Space 15 ft.; Reach 15 ft.
Base Atk +9; CMB +19; CMD 25 (can’t be tripped)
Environment temperate and warm marshes and underground
No simple garden pests, giant slugs pose a serious threat to those caught in their path. Folk who dwell near swamps and other regions that support giant slugs risk losing livestock and even their homes to these enormous beasts. Giant slugs constantly wander in search of food, their preference being fleshy organic material, which they slice into smaller, easily gulped chunks with their rasp-like tongues.
What strange influence might have caused the first giant slugs to grow to such monstrous proportions is unknown, but today, giant slugs breed true and birth their oversized offspring after a fleshy, squirming courtship ritual. After mating, a female giant slug lays just over a hundred eggs, each approximately a foot in diameter. The mother slug guards this clutch fiercely and aggressively attacks any creatures that wander too close. Giant slugs inhabiting swamps aboveground mate once a year, and those who live in the area know better than to go into the swamps during this month.
Deep below ground, some subterranean races use giant slugs as mounts or guardians. Creatures like mites, who have a strange empathy with vermin, can be used to keep giant slugs docile, but in most cases, those who would use giant slugs must do so with great care, keeping them well fed until they are needed for battle. Frightened whispers report armies of troglodytes using giant slugs as siege mounts. One particularly disturbing tale mentions a vast underground cavern inhabited by scores of skum and aboleth-controlled aquatic giant slugs with strange, mind-numbing abilities infused into their acidic saliva.