Sometimes I wonder if we are the bad guys

We spent three days on a riverboat from Great Forks to Caenen. Unfortunately we didn't get a chance to hunt down that bitch MingWa. I'll never forgive her for attacking me and my family; I hope one day after we have sought vengeance for Mother that I can come back and hunt her down.
 
When in Caenen we learned from the Shogun that he had placed an embargo on ships going to the Blessed Isle because of pirates. Mae and Mishal found a captain that was willing to smuggle us in so long as we destroyed a cult and an uppity god who was causing havoc. We also met Storm, who recommended we visit his friend Costera if we got a chance.
 
We set off, and walked along the beach, when it felt suddenly like I movd one kilometre forward with one step. Strange. Heavens thought there must be sorcery involved, and dispelled the magic. Suddenly our group was split in two, half on one side of the cove and half on the other. A big cove of water in between. There were huts and a longhouse so we decided to make our way to them. Thrudd got there first and offended the guy, and he used a tsunami to attack Thrudd. Thrudd decided to leave before any more havoc could be wrought. Galit and Kai then approached, and they managed to somehow calm him down so that we were allowed in the village.
 
Mae got upset that we were accepting his hospitality instead of outright attacking him. Apparently Costera and his cult were the ones we were meant to fight, but at this stage they were hospitable towards us. He invited all of us except Thrudd into the longhouse, using magic to make sure we couldn't hurt him while under his roof. We discussed Storm and how strange it was that he could keep up with us while we were travelling given he was merely a commoner and surely required sleep. Then he quietly mentioned he was working at disrupting the system, and working with an anathema to do so.
 
We couldn't let that stand. So we left the longhouse, and came back in and attacked him. It was a tough fight. Unfortunately he was super powerful, and swept us all out to sea, disappearing in the meantime.
 
As much as I dislike the anathema, I have to wonder - Costera was nothing but nice to (most of) us. He welcomed us with hospitality. Are we wrong to be fighting him? I genuinely don't know.
 
Hopefully with him disappearing it's enough to book us passage on that ship. We need to get to the blessed isle to find out more about five days of darkness, and how to defeat him. For mother's sake.