http://hellgate.ingame.de/charplanner/evoker/?l=50&aa=0&a=00000000&s=000001321033000a003a00000010remaining points to: dual focus as needed for willpower, tempest for damage, maybe 1 in ember, maybe 1 in swarm for more field stacking, or (my preference) up to 10 in spectral curse.
Skullsplitter is craaazy damage, but you gotta get used to how to aim it - its not as hard as some will try to make you think. look up Skullsplitter HGL on youtube - youll find how to aim it and how good it is. Arc Legion is also amazing, but is (usually, the usefulness/buggyness of shock is debated) a 1 point wonder. I personally am gonna max spectral curse, i dont like tempest. tempest does great damage, but i never use it except on bosses. Spectral curse is AWESOME on massive massive groups of things, or zombie summoners. Curse + lightning field or something = everything dead including summoner. plus the slow is helpful for setting up aoe fields or for getting distance to throw skullsplitter.