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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
Several missions that Roxas undertakes for Organization XIII have him eliminating Shadow Globs. The globs attract Pureblood Heartless, thus interfering with the Organization's goal of harvesting the hearts of Emblem Heartless.
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.