I'm near certain that Rammus is a Baccai
Baccai are failed ascendants, often twisted or malformed. Rammus perfectly fits this. In his short story, he demonstrates godlike feats and is already known to be immortal. He has the characteristics of the ascended, but then seems messed up. He's nearly humanoid, but the animal part is definitely the dominant look on him. I mean if there was a list of things required for him to believably be a Baccai, he's definitely fulfilled every characteristic you could think of.