Irthos and the Anathema.
My version of these guys differ a little bit from the official D&D lore.
In my headcanon the Anathemas are something like the Wise Elders of the Yuan-ti, spending most of their time in meditation or hibernation, waking up occasionally to share their knowledge to new generations and to offer advice and wisdom to new leaders and priests.
Art and characters by Fortuna
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BlindSnake
Just a bit.