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Do they exist, canon?  Is there a Dragon Magazine or a book or something where these creatures exists with a description and background information?  I've managed to locate an ooze weird in Champions of Ruin, under The Death Shallows, but it only has a stat block and no other information.  I was just wondering if there is any literature similar to the weirds as they appear in the Monster Manual 2 and in Dragon 347?