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.

At the start of each of your turns if the dragon is within 20 meters of you, you can cause it to move up to 2 meters in a direction that you choose. If you spend an action, you can move it up to 10 meters.

A creature can use an action to examine the dragon, making a skill 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.

Augment

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 2d10 damage of the chosen damage type on a failed save, or half as much damage on a successful one.