We need to think as if there is any counter skill in 1 side towards the other side. Well there is, for any bad effect from legion, sentinel has redemption. It is correct that priest can be stunned; however, necro can be stunned as well, furthermore necro’s combo with full pvp items skills are damaging 300-400, and also it deals damage after the combo time expires which is 8s as I know. Being stunned can not be an argument since both can.
P.s The Ancestrais Guild is using lots of mages, I strongly believe that’s the issue why they lose. Try to use more other aoe classes with aoe combos and you will be able to fight fairly. Of course while 1 side wins another will lose but that does not mean it is unfair, KINGDOM guild sacrifise their everything for GvG skill builds.Plus, their guild players are mostly aoe players instead of rogues(I just saw 1-2 rogues). Therefore, try to build your guild with different classes such as paladins, priests, templars, Bladedancers, rangers( seeker is useless as rogues are :))