Homebrew, Ravenloft: Denizens of Darkness (3.5e)
Antimagic Venom. Witchbane leeches have a venom that inhibits magical abilities in its prey. When a creature is hit with the swarm's bite, it must make a DC 12 Constitution saving throw. If it fails, the creature suffers the following penalties for 1 minute:
Swarm. The swarm can occupy another creature's space & vice versa, & the swarm can move through any opening large enough for a Tiny insect. The swarm can't regain hit points or gain temporary hit points, aside from its bite attack.
Bite. Melee Weapon Attack: +3 to hit, reach 0', one target in the swarm's space. Hit: 10 (4d4) piercing damage, or 5 (2d4) piercing damage it the swarm has half of its hit points or fewer. The swarm regains hit points up to its hit point maximum that equals half the piercing damage from the attack.
Swamp
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