Empty necromancer (not sexual)
Bardeelus' counter-attack was efficient, he killed four of these dragons already, because of the twenty souls he unleashed. These enemies had already been dead, on the count that they were ghosts ~ he just managed to wipe them out of existence entirely.
They disintegrated. The one-punch (or kick) attacks which his summoned souls inflicted, were enough for the deed. He lost almost every soul which he had harvested ever since the beginning, but it felt worthwhile!
To kill the last and most powerful dragon, he had to try a little harder. About five souls had already attacked it, yet it was still kicking, so he figured that it would take another little push, to end this battle.
"A few more scorpion souls should do it… maybe I'll use the deer souls too." He planned.