Shaman Karrakh quest chain..?! (Spoilers)

[xxspectrexx]

I was curious I have gotten to the elven lands and met with shaman Karrakh for the second time. I noticed that you can summon the turtle and then kill him or let him go.... if you kill him it says and so ends shaman Karrakh's plot. If you let him go hes says he will not forget you he remembers all.

My question is if you let him go do you meet up with him later and if you do does he give you a good artifact or help you out? Has anybody followed this to the end?