Attack already exists, and it includes standard tactics, ranged attacks, and ballistics.
In Darkness and Light, skills focus on mass spells; you can take Storm Wind instead of Mass Divine Spells and Force of Will.
Luck can be increased through resistance and Elven skills.
The last slot should be Leadership or Logistics.
I don't see much point in the Defense skill, as enemies don't reach our troops, and those who do won't last long. A high defense stat for the hero and mass evasion will be sufficient, and there's also Stone Skin and Weakness.