Blavi waved his hand and sent a large fireball towards the phantom dragon. The mages around him followed suit, summoning and launching hundreds of fireballs towards the dragon. An attack like this was no different than a high level spell, like the meteor spell.
The ghost dragon flapped its wings and dove down, flying through the fire. The dragon roared and was blown into pieces. A few fireballs flew past the dragon and towards the necromancers behind it. Unfortunately, the attack was blocked by the bone shields.
The scroll that enabled the necromancers to summon ghost dragons was very rare and usually reserved for use against a difficult opponent. Using it on some mages was a waste, but the necromancers did not have time to regret their decision. "Hurry," one of the necromancers called. "Let’s go!"