By killing a warder / keeper you get the NP's. I do not think that you should get an extra 'reward' for this. As well like other ppl said, the sins will drain and win. So that will be the next problem. Also, a war is a nation event which has to be a nation wide reward. That's where the invasion comes in perspective.

The 'reward' you are referring to, is a personal gain which will not be introduced in a war unless there is a specific event or announcement.

With all do respect, but -1 from me

i agree with u also nyllian but this good idea can reward for who kill it more in the mouth i mean who is kill wards and keep more in mouth got reward
GL