Note: This one will be for a mid-level tier and up for a while. It will become available to Apprentices after a while. I'm doing this because the PCs in my Wednesday night game have just encountered the first mentions of Mahta'Uah. Two of the players are Apprentice patrons and I don't want to drop spoilers this early.
This beautiful CR 27 creature is a dangerous foe that may be encountered on islands and coastlines, above or below the sea. They sparkle in even dim light and definitely have a thing for jewels and gemstones.
This is my 31st and final creation for Jewel-ly, an entire month of daily jewel/gem-related homebrew content.
Mahta'Uah could be a foe a party just encounters, or could be a dangerous being that is actively seeking magical gems like yesterday's Opal Beacon of Lux.
Have fun with this one!
Update 2022-08-04: Added missing text for Mahta'Uah's lair stuff (lair actions and regional effects).