Source Pathfinder #25: The Bastards of Erebus pg. 78
Rot Grubs As Hazards (Cr 4)Smaller groups of normal-sized rot grubs do not constitute a swarm, but even individually they're quite dangerous. Generally, a handful of the grubs infest a single corpse at a time, and a DC 15 Perception check is enough to note the infestation before the grubs have a chance to attack anything living that comes in contact with the corpse. If the Perception check is failed, 1d6 grubs swiftly burst from the carcass to burrow into the creature, which can attempt a DC 15 Reflex save to avoid the grubs (but only if the creature is aware of the grubs' presence).
Once rot grubs are burrowing in a living body, the host must make a DC 17 Fortitude save each round. Failure results in 2 points of Constitution damage per grub infesting the victim—at Constitution 0, the rot grubs have reached the host's heart, brain, and other key internal organs and death occurs.
On the first round of infestation, applying flame to the point of entry can kill the grubs and save the host, but this inflicts 1d6 points of fire damage to the victim. Cutting the grubs out also works, but the longer the grubs remain in a host, the more damage this method does. For each round that the grubs have remained in a host, cutting them out requires a slashing weapon and a DC 20 Heal check, and inflicts 1d6 points of damage per round that the host has been infested. On a successful Heal check, the grubs are removed. A remove disease spell (or similar effect) instantly halts the infestation, but as the grubs themselves are parasites, immunity to disease offers no protection against infestation. Any amount of damage reduction is enough to provide immunity to infestation, however. Infested UndeadSince rot grubs only feed on living flesh and use dead flesh as an incubator, undead are not harmed by infestations of the parasites. A corporeal, non-skeletal undead infested with rot grubs transfers one rot grub to any creature that touches it or to any creature it strikes with a touch attack or with any natural attack. The target may make a DC 15 Reflex save to avoid being infested, but otherwise is immediately subjected to a single grub burrowing through his flesh. A rot-grub-infested undead's CR increases by +1.MembersGiant Rot Grub (CR 3), Rot Grub Swarm (CR 7)
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