Divine Sword

This spell is handy not for its damage (unless you chose to get stats for air damage) but for the bonus it gives to your attack. The downside is that it is onle 1 range, but that doesnt stop you from using it with no target. You should use this to buff yourself when not in range of an attacker, as the damage buff will remain for 4 turns and stack. Personally, I would not raise it past 3 if at all, since at 3 it adds +2 damage instead of +1.