I was wondering if you can outright kill him (which i did) just to test the power of my party. Is it advisable to kill him? Any consequences?

No consequences that I know of. I avoid killing him unless I crave his flail 'cause it feels like he's important to the world.

 

 

Only one to share Iselmyr's accent. Oh, and I guess he's protecting some stuff...

 

Oh man I loved watching Eder and Aloth talk to that guy lol. Also just liked the feisty character.

 

Someone will ask you about what you found out down there, but he doesn't have to be alive for that, obviously.