Ok finally decided on the base creature.<br/><br/>Found the Spawn of Juiblex in monster manual 5, which is CR 10 or 14.<br/><br/>Juiblex himself could also work as he is only CR 19 in the lords of the Abyss book, although that might be not that much fun to use.<br/><br/><br/>Either way, both versions, with 6 class levels and maybe a template or two will give me the perfect demonic version of Zamala