Perhaps noone has noticed yet, but the majority of YOU come from other
planes too, so if you want to keep up your petty "no one asked them to
come to our plane" then I suppose you should consider that trolls,
horkvals, atavians (although they were created by one of our Deities,
they are still from another plane, but who's to say the Vertani weren't
created by Sarapis, no Gods have yet given counsel about the Vertani),
rajamala, and xorans are all from other planes and came of their own
will. Did we kill them? No. As for their fortress, it's perfectly
reasonable, if el'Jazira asked for it I'm fairly certain that one of the
great cities would come and offer protection to them, how is this any
different?

Also, as I said, have you ASKED any of the Gods? Perhaps this IS
Sarapis's will, maybe their God IS Sarapis, stop making assumptions
about the immortals, there's no way you or I could possibly understand
their motives.

Penned by my hand on the 12th of Chronos, in the year 381 AF.