The Practical Guide to Monsters has a few monsters that don’t have Microlite20 versions. Ormyrrs stick out to me more than the others. For reference: Thri-kreen, Yuan-ti, werebear, wereboar, ghost, and lich do not have M20-style stat blocks that I have found. Some of those have enough substitutes you can reskin (lycanthropes and generic undead), while “lich” can be applied as a template. But I like these slug-looking characters that clearly have no relation whatsoever to Hutts. In fact, the D&D Fifth Edition doesn’t have them, either.
Orymyrrs have enormous grublike bodies that possess powerful arms, a mouthful of extremely sharp teeth, and a surprisingly intelligent brain. They aren’t particularly aggressive, tending to keep to themselves.
While (or perhaps because) these creatures have no talent for casting spells, they find magic absolutely irresistible. They will lie, cheat, and steal to obtain a scroll, spellbook, or other magical object, and can be mesmerized by a skillful display of magic powers.
The book also notes that they tend to live in a solitary state or in small tribes of no more than one dozen. I would use the following stat block. DMs may want to adjust the to-hit numbers (especially slam). They should also target magic users of whatever flavor first.
Ormyrr: HD 7d8+7 (43 hp), AC 15, Slam +6 (1d4+1), spear +8 (1d6+6), constrict (2d6)
Technoskald's Forge 