The Professional Levels of the three Battle Mages were enough to let them use third-ring Spell wands like ordinary sixth-level Mages, the most representative of which were the Fireball Magic Wand and the Paralysis Wand, turning them into magical artillery on the battlefield, providing group Attack and control support.
His Attributes were quite balanced, each being above twelve points, with Intelligence naturally being the highest at fourteen points.
When placed in front of Gaven's group of freaks, naturally it didn't seem sufficient, but amongst his peers, especially given the lack of basic education, it was already considered innately high Intelligence.
To control an army, especially one mostly comprised of unruly mercenaries.
As Kopofiel said, personal combat power was one of Darren's significant weaknesses. Even attempting to use Zalanda's Elite Grace from the Path of War to catalyze a jump to Transcendence wouldn't be quick enough.