Ryan equipped his Spiritualist's Crossbow and began to pull the trigger to destroy the Ice Spears. When the objects collided, obviously Ryan's projectiles won. They had a special effect that granted them the chance to drain mana. The Reptilians bosses were meleed fighters. So, their magic attacks were seriously lacking.
Since he focused on standing still while flying and destroying the magic projectiles, the other bosses also used that chance to make their spears touch the barrier and drain mana from it. They also began to attack Ryan using Ice Spears.
"Hehe, dumbasses…." Ryan grinned from ear to ear.