Planar Bestiary
A luck lamprey is a multicolored, foot-long worm with a grey, toothed, sucker-like mouth on each end. They survive by eating blood and insects, but can reproduce only after consuming good luck from other creatures. They have beast-level intelligence (on par with a housecat) and often live on the fringes of humanoid settlements, as if such creatures have more or better-quality luck they can feed upon.
Some people keep luck lampreys as pets, for the lamprey can influence chance events in favor of a creature they are touching. The lamprey must be fed at least once a day, equivalent to 1 point of health's worth of blood, either from their owner or from some other living creature. A well-fed lamprey is lethargic, content to rest draped around their keeper's neck and becoming active only when threatened.
Luck lampreys spawn in slow or still water and die shortly after spawning. An adult lamprey can live up to two years if their keeper doesn't allow them to mate. Of a clutch of hundreds of eggs, a few dozen survive predation to become thumbnail-sized larvae, which feed on slime and detritus for a few years until they develop the ability to crawl on land and grow to full size.
GM Intrusion: A freaky, hard-to-have-anticipated unlucky accident endangers a character, such as a mundane object falling from a nearby structure, which spooks a mount, which knocks the character into the path of an oncoming wagon.
Motive: Hungers for blood, insects, and good luck
Environment: Limbo, worlds of the Material Plane, alone or in small groups, or kept by an intelligent creature
Health: 6
Damage Inflicted: Minor wound (2 points)
Armor: 1
Movement: Immediate; immediate when burrowing, climbing, and swimming
Modifications: Speed defense as level 4 due tiny size; stealth as level 5
Combat: The luck lamprey's bite inflicts damage and attaches the parasite to their target. All the tasks of a victim with an attached lamprey are hindered (because the lamprey is consuming the victim's luck). In addition, the victim automatically takes 2 points of damage each round thereafter until the attached lamprey can be removed with a successful Might task as an action.
Once each round, one creature within short range of a luck lamprey that attempts any kind of task must succeed on a level 4 Intellect task first, or the task fails (because their luck was eaten), and the luck lamprey regains 1 point of health.
About once each hour, the lamprey can drain luck from a foe within short range, treating the character's roll as a natural 1, regardless of what the character actually rolled (triggering a GM Intrusion for a PC) and the luck lamprey regains 3 points of health.
If the lamprey is touching an ally (as opposed to being attached to a victim), the ally is lucky, and once per round they may ease a task they attempt.
Interaction: Luck lampreys are animals, but with enough attention and training, individuals can be trained to be pets.
Use: A character's rival, competitor, or adversary has a strange, lamprey-like pet. That's weird, but his unrelenting good luck is starting to chafe.
If a skein's mask lure is destroyed, the masked skein themself remains safe within their personal dimension.
Mask Lure: level 2, flies a short distance each round; serves as a focus for the actual masked skein's teleport attacks and window into the world; if the lure is destroyed, the masked skein produces a new one within a few days.
GM Intrusion: Another creature—perhaps a devil—is already hiding in the masked skein's personal dimension. Allied with the masked skein, they also attack the character pulled into the dimension.