Every so often in Vikings: Wolves of Midgard, the game presents you with a couple of dialogue options. For some reason, I thought these were just for flavor. But it turns out they actually change the story slightly!
For example, the crone Vala was urging my character to forge an alliance with the giant Simul, the enemy of my enemy. There was an option to say "Alliance? Doesn't she have any treasure?" I took the option on a whim. Then the next map turned out to be attacking Simul and stealing her ring Draupnir.
Once I stole the ring, Vala asked that I give it to her, so that she could return Draupnir to Odin. I chose the "No, I stole it. It is mine!" option. Vala informed me that I had succumbed to curse of the ring. The game then announced that I would get an extra 3000 gold per map, but could not sacrifice to Odin to level up anymore. This would last until I gave up the ring to my soothsayer.
The next quest text, narrated by Vala, then talked about how the "rapacious greed of the Ulfung she-wolf might doom us all." I was greatly amused!
I don't think the story greatly changes, I think we're still on track for an alliance of necessity with Simul. But I really like how the developers have woven a little bit of choice into the game.