Phantom Dragon

You tap your dragon magic to make an ally appear as a draconic beast. The target of the spell appears to be a dragon of size Large or smaller. When seeing this illusion, observers make a Wisdom saving throw to see through it. You can use an action to make the illusory dragon seem ferocious. Choose one creature within 30 feet of the illusory dragon to make a Wisdom saving throw. If it fails, the creature is frightened. The creature remains frightened until it uses an action to make a successful Wisdom saving throw or the spell’s duration expires.