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The Shadow Glob is a Pureblood Heartless that is found in Kingdom Hearts and Kingdom Hearts 358/2 Days. It is an immobile, black-violet orb of darkness. While it does appear in Kingdom Hearts, it is unnamed, and is only given a name and journal entry in Kingdom Hearts 358/2 Days.
After Oogie Boogie is defeated, his darkness, in the form of Shadow Globs, brings him back to life by fusing the villain with his manor as a giant monster. However, Sora, Donald, Goofy, and Jack Skellington manage to put him down for good by destroying the Shadow Globs that were animating him.
Kingdom Hearts 358/2 Days
According to the data Saïx provides Roxas, Shadow Globs are naturally occurring dark masses that attract Pureblood Heartless. However, they only appear in worlds where the Heartless have already infiltrated.
Twilight Town, Beast's Castle, Agrabah, Neverland, Wonderland, and Halloween Town each suffer at least one infestation of Shadow Globs during Roxas's time in the Organization. Roxas is sent to get rid of them, in order to restore the emblem Heartless quality for heart collection.
As simple as they come, Shadow Globs are semi-spherical, tumorous, black blobs with an inner purple glow. When hit, they wobble much like gelatin.
In Kingdom Hearts, Shadow Globs are capable of casting Fire against you when near them.