Planar Bestiary
These insectoid fiends feed on magic, though if no magic is available, they can subsist on egregious amounts of blood from living things. Their wings keep them almost constantly aloft, and their many chiton-plated arms clatter and click as they try to latch onto fresh prey with their spell-eating mandibles.
A less well-known variety of yugoloth (a variety of fiend related to devils and demons), a devouloth is hated by other yugoloths for the ability to eat their magic just as easily as they eat the magic of mortal victims. Which is why devouloths are hunted, even among their own kind, but also by demons and devils.
Devouloths are so detested that the species has disappeared almost entirely, except for a few hidden conclaves encysted across the planes of existence.
Motive: Hungers for magic
Environment: Anywhere in the multiverse
Health: 21
Damage Inflicted: Moderate wound (5 points)
Armor: 2
Movement: Immediate; short when flying
Modifications: Perception as level 8
Combat: A devouloth attacks twice each round, once with their bite and once with their claws. In addition to damage, a target hit by a claw attack is grabbed until they can escape. All the grabbed target's physical tasks are hindered.
As their action, a devouloth can attempt to consume a portion of the magic of any creature they have grabbed (or charmed; see GM Intrusion). On a failed Intellect defense task, the target takes 5 points of Intellect damage (ignores Armor) from a psychic intrusion. The victim also loses access to one of their magic abilities or spells for one day as the devouloth consumes the magic. If the target has no magic or spells, they take another 2 points of Intellect damage (ignores Armor). In either case, the devouloth regains 5 points of health.
A devouloth is immune to acid and poison attacks.
Interaction: Devouloths are schemers, always looking for higher concentrations of magical ability to feed on. Which means they may be open to negotiation, should a victim promise to lead the fiend to some richer source of magic. The devouloth can speak in the languages of demons and devils (Abyssal and Infernal), as well as telepathically.
Use: A minor demon begs the characters for help against the constant depredations of a devouloth.
Loot: Devouloths sometimes carry magic items that, in a pinch, they can consume the magic of (and regain 5 points of health), such as a scroll of inferno wall or a potion of intelligence enhancement.
GM Intrusion: A character that fails an Intellect defense task comes under the mental control of the devouloth, and willingly obeys their telepathic commands for one minute (or, on a successful defense task, only during their next turn). If the controlled target takes damage or is commanded to harm themself, they can repeat the defense task to end the effect early.