Ksu'la

Ksu'la is an unknown creature that, presumably, manifests itself in the form of an arcane serpent.

Arcanital Ra'kul manifest the spirit of Ksu'la on the Isle of Thunder and transform into an arcane serpent. Ra'kul's brother Spiritbinder Tu'chek wear a mask depicting a serpent loa,  it's unclear if this is Ksu'la and they both worship the same loa, or if Ksu'la is even a loa at all.