No, this one is nothing like that. Cool though wasn't it? I fondly remember some 26th level (or so) heroes in my 2nd Edition AD&D game facing off against a Yochlol, in the heart of a dwaer'syth's spelljamming vessel, and things coming unstuck really quickly when it vomited a double strength Creeping Doom at them (Traveller teleported back to his own ship, leaving poor old King Brundor to take the brunt himself. He was skeletonised...not for the first or indeed, last time).
|"Ha ha ha! This is fun. The pain is excruciating."|
Anyway, this may or may not have been created because one of my groups are in the middle of (loudly) infiltrating a dwaer'syth house compound, and are very likely to face against Creeping Dooms, and those able to summon them.
You may have noted that I have taken quite a few cues from 4e's swarms. That's because I actually think 4e did swarms perfectly. Swarms are, and should be seen as, terrifying things.