What happens if you let the dragon(s) live?

[Zelse]

Have always killed them for crafting mats.

 

The dragon in the watershapers guild in particular? Anything useful he can do? Maybe fight a stronger version of him later?

 

The fire dragon i assume can carry you to eothas if you have high enough intimidate or sth...?

[wRAR]

The water dragon helps in the scripted battle in Ondra's Mortar (the fire giants too, btw).

I haven't seen the fire dragon after driving her out.

[Tick]

wRAR explained the water dragon. I didn't kill the fire dragon, but I only convinced her to tell me what to do and then grab a thing to do it. I don't know (and would be surprised) if you can get her to help you.

[Suen]

If you free the water dragon you can get a scripted interaction with some workers in Neketaka linked to the event.

Nothing else in my game. As the sea creature passed my ship without attacking, the water dragon never came to help. 

[Hulk'O'Saurus]

Let both dragons go. Don't remember seeing either of them again. 

 

To be honest, I would always do that if I find myself in the watcher's shoes. You don't just attack a dragon, right? Well... in easy poe2, apparently, you always do. 

[Celan]

I let both dragons go and never saw them again. Had to listen to Onekaza berate me about the water dragon, that was it.

[Tanlaus]

I always try to not fight dragons after Game of Thrones made me a fan of dragons.

[Taevyr]

The Watershaper dragon helps in the battle before entering Ondra's Mortar, but i never saw the dragon at magran's teeth again.

[Verde]

If you free the water dragon you can get a scripted interaction with some workers in Neketaka linked to the event.

Nothing else in my game. As the sea creature passed my ship without attacking, the water dragon never came to help.

He helped me but not sure what it actually did. First playthrough I just bypassed the fight.