Does anyone know if there is a 3.5e published version (even in a magazine) of the monster called Mihstu?
There are stats for it for previous (AD&D and OD&D) editions and pathfinder but no stats for 3.5 edition.
The mihstu is in the Tome of Horrors by Necromancer Games for the original unrevised 3rd Edition, and in the Tome of Horrors Revised for 3.5e, which to my knowledge had special approval from Wizards of the Coast to update existing official creatures from AD&D. This might be the closest to an official 3rd edition version of the creature.