i kill the dragon will several magic only
1:Magic Circle Against Evil
2
lanar Ally: Fire Elemental ,Planar Ally: Earth Elemental
3
ne man stand in front of the dragon with Otiluke's Resilient Sphere to take all the physical damage from the dragon
4:the rest of party walk as far as possible away from the battle field
5:wirzard use Mordenkainen's Force Missiles or Mordenkainen's Sword to attack the dragon depend on your level