Quote Originally Posted by Hainiryun View Post
Urianger's constant deceptions are a bit of a running gag at this point but it's always been a part of his characterisation that he's not just doing it for funsies, he'll act as a double agent or conceal the truth because he genuinely believes it necessary, that doesn't mean he enjoys doing it.
This is the big thing with his characterisation. He does what he does because he's been put in a position where he has to see that logically this thing needs to happen and he's the one person positioned to achieve it, and the only way for it to succeed is to deceive his friends. He hates it but he can see the alternative is worse.

I also think people give him far too much blame for doing it again in Shadowbringers. It was the Exarch who pulled him aside, told him a secret that he can see is far too important to break and is basically "well you've got to be part of this scheme now or a hundred years of planning and the fate of two worlds may be doomed, especially if you tell your friends the truth at this point. Thanks for agreeing to help."