Alright.
1st I cannot urge you strong enough to get the weapon skills. Kd with save you butt if your s/s amd the HP buff from spear will help you be able to tank a lil more *which every nuker needs*
Now to the builds...
A good s/s nuker build is 90bicheon/90light/90ice/30fire or force
Now most people say don't go pure int with a spear simply because it can't tank as well as a s/s nuker can because it doesn't have a shield. But on the + side it does much better damage then s/s do. So most people say go 1:5 hybrid int with a spear. But if you want to make a pure int spear nuker go with 90heuskal/90light/90ice/30fire or force. Just remember that you won't be able to tank much but you'll have the highest amount of damage for a chinese char
