Basil was still familiarizing himself with Caliburn, his new sword. Despite so however, the Demons coming at him could do nothing when he swung Caliburn at them.
Basil's Aura Ability: [Master of Weapons] allowed him to do two things. First, it allowed him to master any weapons he laid his hands on, and second, it allowed him to telekinetically control every bladed weapons he laid his eyes on.
Although he was still not that familiar with Caliburn, due to his Aura Ability, his fight with the Demons wasn't hampered at all. Coupled with his more than a decade of battle experience, he was unstoppable in the battlefield.
One might wonder then what 'Familiarizing' actually means if Basil could already wield Caliburn so well, and the answer was slightly complicated: to know more about Caliburn, who was an existence with consciousness he had to acknowledge.