Norven, Xandra and Kherak
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Gustav mutters to himself, "The Azure Lich." Turning he visbile shutters at the sight of Kherak but forces a weak smile when he sees Norven and Xandra behind him. "Terrible, isn't it? I've asked the captain to not make stops till we reach the deltas near Ghant but they fear this part of the river may be trapped or worse, tainted."
Gorbas
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You recognize it as a symbol of timelessness used by Herod the Blue, a powerful Lich who's claimed dominion of everything west of river completely uncontested. Perhaps what is frightening everyone is that these macabre symbols are being found along the shore opposite of his blasted lands. You have plenty of time to contemplate this as no one notices you nor your raven as they scurry about like ants on the deck.