The Strange Bestiary
The huge, undulating mass of this creature is composed of a mucus-like solid. The half-amorphous blob defeats its foes by absorbing prey, integrating a victim's tissue into its own. In essence, the victim becomes the blob, and all of the victim's knowledge is available to the blob for later use.
If it later desires, a blob can release a nearly perfect replicant of any creature that it has absorbed. Replicants have the memories and personalities of the originals, but they do the blob's bidding, which is usually to explore distant locations or lure prey into the open using a friendly face. A particularly wellcrafted replicant might not even know it's not the original. Creating a replicant takes a blob a day or two of effort, during which time it's unable to defend itself or eat, so it's not a task the creature attempts lightly.
Blobs are born in recursions created by fictional leakage of 1950s American horror/science fiction films. That doesn't make them any less frightening. The worst nightmare of an agency like OSR, the Estate, or the Quiet Cabal would be to run across a quickened blob able to send quickened portions of itself as replicants into other recursions or to Earth to begin the process of assimilation.
Motive: Assimilation of all flesh
Environment (Weird Science): Anywhere
Health: 66
Damage Inflicted: Major wound (8 points)
Movement: Immediate; immediate when burrowing
Modifications: Speed defense as level 5 due to size.
Combat: The blob can project a gout of acid at short range against a single target. Though slow, a blob is always moving forward. A character (or two characters next to each other) within immediate range of a blob must succeed on a Might defense roll each round or be partly caught under the heaving mass of the advancing creature. A caught victim adheres to the blob's surface and takes 10 points of damage each round. The victim must succeed on a Might defense roll to pull free. A victim who dies from this damage is consumed by the blob, and his body becomes part of the creature.
If a blob has absorbed living flesh within the last hour, it regenerates 3 points of health per round while its health is above 0.
Interaction: A blob's favored method of communication is to absorb whoever tries to interact with it. If a replicant is handy, the blob might talk through it if the blob can touch the replicant and use it like a puppet.
Use: The old man the PCs accidentally hit with their vehicle has a weird, mucus-like growth on one hand (in addition to the damage he sustained in the accident). He probably should be taken to the hospital to have his injuries and the quivering growth looked at.
Loot: A blob might have several cyphers swirling about in its mass that it uses to outfit replicants.
GM Intrusion: The character pulls free of a blob he was caught under, but a piece of quivering protoplasm remains stuck to his flesh. He must do serious damage to himself (enough to incapacitate) within the hour, scraping off the protoplasm before it absorbs him and becomes a new mini-blob.