Finding Sera

Kasdri Valmorn seeks out Arabella Whitby, in hopes of recovering "The Cube". He claims that if he can find her and retrieve it, he can give it to Stelli'Aris and Praeteris, and "return home".
According to Krolech Icebeard, Sera is currently somewhere in Westbrooke.
She was contacted at the behest of Kasdri by Tovis Blacktree, but upon arriving at the house, she claimed she had never met Kasdri, and warned Group Alpha not to speak to her again.
After persistent pestering, she gave a clue as to where to locate Praeteris. She said the following:
"North East. Find the wall. Find the guardian. Find the one who has been there before."
With a new era of cooperation between Group Alpha and Sera, marked with the purification of the First Vestige, Sera is able to be reliably contacted and spoken to, though she seems to be hesitant to fully trust Group Alpha.
Related Quests: Finding Ioris Seldahn, Finding Praeteris