As two actions, you create a Huge dragon in an unoccupied space that you can see within 20 meters. The illusion lasts for the duration and occupies its space, as if it were a creature.
When the illusion appears, each creature of your choice in a sphere twice as big as normal around it and that can see it must succeed on a Will saving throw or become frightened of it for the duration. If a frightened creature ends its turn in a location where it doesn’t have line of sight to the illusion, it can repeat the saving throw, ending the effect on itself on a success.
As an action, you can move the illusion up to 10 meters.
A creature can use an action to examine the dragon, making an ability check using Insight (Intelligence) against your spell save Difficulty. If it succeeds, it becomes aware that it is an illusion. If a creature discerns the illusion for what it is, the creature can see through it and has advantage on saving throws against it.
You can expend 2 additional mana so the illusion becomes tangible, but attacks miss it automatically, it succeeds on all saving throws, and it is immune to all damage and conditions. The dragon gains a breath weapon. When you create the dragon, choose a damage type: acid, cold, fire, lightning, necrotic, or poison. The breath weapon can be used at any point during its movement to exhale a blast of energy in a cone or line originating from its space. Each creature in the area must make a Will saving throw, taking 2d12 damage of the chosen damage type on a failed save, or half as much damage on a successful one.