So during the coldharbor quests you get to make some choices on allies. I would like to know the benefits, cons of choosing either the lamia or the wood elves, such as:

1.) Do the lamia show up in the city, and what do they offer?
2.) Do the Shadow Walkers show up in the city and what do they offer?
3.) What later game effects does this choice have on the Hallowed City?

Thanks in advance for the incoming answers.