Dragon Cojuration Spell

The caster of the spell must make a series of signs with the hands, creating the spell. Then, the caster throws his/her hands out and a red/green dragon will appear depending on the environment. In order to cast this spell, the caster must succeed a DC 16 Dexterity check. The dragon will obey the casters commands until its duration has been spent. The dragon cannot speak unless the caster speaks through it (the caster extends both arms towards the wyrm and speaks whatever words they want to). The dragon uses the 5e red or green dragon stat block when fighting (depending on its type).