Who, if not them, should have soldier's luck!?
(casters, bears, priests, berserkers, can stun, I think)
Runic Harmony is also a great tip; it suits everyone. Leadership in the fifth game has never hurt anyone, and here's another bonus.
I think education is needed for dwarves in long battles, as their stats grow by almost one and a half times (what kind of artifacts would you need to wear to achieve such an effect?).
So, we have luck, leadership, education, light magic (there's not enough skill for chaos magic), and protection (for a battle to the last).