Ancestors' Rage and Splinter Weapon are great, but you still have 6 skill slots left over. Stay away from the spirit-conditional damage spells like Spirit Burn.
Any idea's to combine then with the sunspear skill Intensity
could be an easy way to do 25% more damage.
I just tested it on MoD at 15 channeling. Spirit Rift does 135 damage without and 169 damage with Intensity.
Though, I can't really think of any situations where I would bring that skill tbh.
Yeah, I now run a sort of spirit/channel build, with ancestor's rage, splinter weap, Spirit Light, Spirit Rift, Offering of Spirits, Summon Spirits, Bloodsong, and Vampirism.