Each weapon in this game has some extremely useful skills, you should learn and use them for this reason.
The 4 stances
the passives to increase items efficiency
The passives to decrease casting time
Elemental magic :
The 4 tier 3 and 4 spells on one target
Divine magic :
Healing spells up to +heal3
Fortify, mana barrier, haste (and their + versions if you can)
Divine lore if you have enough SP.
Don't hesitate to say if you have a different opinion about the must have skills in the game . Or if I forgot some things, I did that from memory, without checking the skills in each weapon tree.