3 if you count Zodiark's Endcaller. Zodiark is also Elidibus if you think about it. I mean, he did split from him, but he was still his heart for a while. In my book that makes Zodiark Elidibus, similar to how Venat became Hydaelyn.
Well the circumstances are different here than before in the first. It’s not as if Themis had to fight us, but was forced to by Athena. However, considering this Themis remembers fighting us before, it’s no surprise that he proves to be a force to be reckon with once more. Although I did enjoy Seat of Sacrifice, I prefer this variation of Elidibus.