Magnus’s RPG empire on the portal.

-Damn it!!!He looked at the sky.-Yeah...I need a GHOST DRAGON, and I need it FAST!!!

A dragon is flying towards you. You mounted it, but there are some barriers around the city. You managed to overcome them, more or less. But the dragon is losing HP. It has 30 HP left. What are your actions? Meanwhile, the titan fell on the army of skeletons and vampires and destroyed them. Only 150 skeleton archers remain. The mages have 3 titans.