Lich?

Dodging the purple balls of fire shot by the undead dragons, the dragon team slammed themselves into the undead dragons but this time, they slashed at the rib section with their claws coated in thick layers of mana.

From the undead dragon, a small purple orb appeared out of nowhere and began to fall. Seeing this, the dragon soldier immediately charged up its breath and unleashed its might on the purple orb, burning it into oblivion. All of us watched as the undead dragon, it once belonged to immediately crumbled into nothingness.

"Watch out for a purple core, destroy it and the undead dragon dies" The Dragon soldier announced to the others.

Taking his advice, the other dragon soldiers immediately attacked but before they could move, all of them began falling out of the sky one by one.

"What was that?" I asked in shock as i turned to the team

"Bring up the footage from all drones, i want to know what caused that" Lady Athena said just as shocked