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Singing Gelatinous Blob
AC 8 (11)
Atk 2 (1d6/2d6)
Special: Paralysis; hypnotic song; immune to lightning and cold
Wizard-spawned kin of gelatinous cubes, singing gelatinous blobs are skin-colored, mouthed blobs of gelatinous flesh that float through abandoned castles, dungeons, and other subterranean passages, keening and singing nonsensical songs while engulfing debris and carrion to digest. Anyone who hears their hypnotic song suffers 1d6 psionic damage and must make a saving throw or become hypnotically induced to walk into the blob while babbling about "merging into oneness"; a PC so hypnotized will actively resist efforts to restrain him. The entire substance of the blob is acidic. If the blob hits successfully, the victim must make a saving throw or become paralyzed (6 turns) for the blob to devour. Most singing gelatinous blobs contain various metallic treasures or gems that they have been engulfed but not yet digested. The mouths of singing gelatinous blobs serve no use except for singing.
(note: non-video portions of this post are considered Open Game Content. Monster write-up based on the gelatinous cube in the Swords & Wizardry SRD