In divine divinity you had to assemble the council of seven. DOS will have 6 origin stories. Just a happy coincidence that they are 5 (or 6) of the races needed in the council of seven. Also it seems that the god's are choosing their champion (trip to the hall of echo's)
So let's do a bit of reasoning:
Rhalic - humans -> Ifan Ben-Mezd
Duna - dwarves -> The beast
Tir-Cendelius - elves -> Sebille
Zorl-Stissa - lizard people -> The Red prince
Vrogir - orcs -> maybe an undead orc??
Xantezza - imps -> maybe undead imp??
Amadia - mages -> Lohse
So I can only conclude that Larian needs a seventh origin story.
Origin 7 confirmed!