Arian Coast conquered by Nikopolan Hegemony.
Forces of Nikopolan Hegemony conquer polis on Arian Coast, without significant resistance from Hellana.
Nikopolan Hegemony slowly expands south, conquering polis on Arian Coast, mostly due to their weakness - they were barely recreated following the reconquest by Hellana when Great Southern War decimated it.
Other polis in Hellana do not react due to ongoing local war for domination between two alliances of polis. While both tried to help, their efforts were ultimately not enough, leading to succesful conquest of Arian Coast.