interesting part is, along with Geomancer, Necromancer was one of the most asked for jobs on a couple of forums, I still want Necromancer, we got Scholar which could be considered a pseudo Geomancer
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Also there is an NPC in Norg that says (pretty much):
"We use a form of magic to bring back the souls of the dead to attack other vessels. It's a bit different than the summoning magic you adventurers use."
Which means the NPC confirms they summon the dead to attack and that Norg is the base of these pirate attacks, which also means that it's the most logical thing to assume that the ship that departs Norg is also the ship that attacks ferrys.