Hailing originally from the Negative+Energy+Plane, slow shadows are horrors resembling twisting, undulating, inky blobs, appearing to grow and shrink as they move. They are living incarnations of the interaction between darkness and light, not undead. They are often found on the Plane+of+Shadow.
Sources
WG5 Mordenkainen's Fantastic Adventure
Monstrous Compendium Annual Volume Four
Dungeon Magazine #112
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