One of two things. Either I am doing it wrong or the Githyanki fight is too difficult for the current level. Every time combat is initiated, of which can not be avoided save never letting Lah'Zael get near them in the first place, They get the drop everytime and wipe out half my party and nearly killing the other half before I can even act. And that is from just 2 of the Gith.
So again, either I am doing it wrong or there is something wrong with the encounter that needs fixing.
Any suggestions?