Ultima the High Seraph.

[Cleretic]

This is assuming that she arrived and stayed on Etheirys during the Sundering. I'm under the impression that Ultima is an entity that has visited us at least twice - once when it left the Heart of Sabik for Athena, and another time during the Allagan era (hence the quote I mentioned earlier).

It's also assuming that she landed on Etheirys before or during the Sundering. What I think could be possible in that 'there's no evidence it didn't happen' way is that Ultima was in (or itself was) a meteor that perhaps scraped the planet before the Sundering, and only crashed into it afterwards. The Heart of Sabik would therefore be part chipped off beforehand, while Ultima itself turns up later.