So this is a Grenadier model, from the period when John Dennett was doing a lot of horrific stuff and Grenadier’s monsters took a really frightening turn. It is a “Giant Bog Rat” from the Dragon Lords “Horrors of the marsh” set.
He doesn’t have the buck teeth you might expect on a rat, but I like the lipless snout with all the teeth showing, and the boils or tumors all over its back are suitably gross. It occurs to me that it would be kind of creepy if those boils hatch rats, like those freaky toads that hatch babies on their backs.
Giant Bog Rat. Mv: 12″ AC: 6 (14) HD: 6 Att: 1 bite (d10 + venom) SV: F6 Ml: 7. Special: surprise, d6 pups hatch from back every round, for six rounds, after the GBR first takes damage; treat the pups as Giant Rats.
Giant Bog Rats (GBR) are a subspecies of the common Rodent of Unusual Size (ROUS), and like them has the ability to hide, despite their large size, surprising prey on a 1-4 on a d6. GBRs are usually encountered alone, but during mating season they may be encountered in groups of 2-6. GBRs are true hermaphrodites, and can reproduce without a mate, but more typically mate with multiple partners who place fertilized zygotes on each others backs. The zygotes bond with the GBR’s bald back and develop into amniotic sacks which look like large boils. When agitated, the sacks may burst, exuding fully formed GBR pups who, unlike many rodents, are born with fur and open eyes. They emerge ravenously hungry and attack any nearby creature on sight. Adult GBRs are more cautious and will attempt to use surprise to catch prey. They prefer to feed on humans and demihumans above all else, but will eat anything. Its relatively weak but copious venom causes those hit by the bite to save versus poison at +2 or die in 2d6 rounds.
I just looked at the insert that came with the Horrors of the Marsh set, and the GBR was statted out as having armor equivalent to “reinforced leather,” speed comparable to a leopard, 20-60 hp, and two attacks: bite for d12 and claw for d6; its special attacks are a 10% chance of inflicting disease with a bite, and on a critical hit, it drags the foe down and crushes it beneath its bulk (400-900 pounds!) for 2d8 damage; no. appearing 1 or a “large pack”.