Dragon's Presence

Upon Casting Each creature of your choice that is within 120 feet of you and aware of it must succeed on your Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature’s saving throw is successful or the effect ends for it.

Fuhthermore you can use as a Bonus Action one of the folowing effect, but you can’t use the same effect two rounds in a row

• Magma erupts from a point on the ground the dragon can see within 120 feet of it, creating a 20-foot-high, 5-foot-radius geyser. Each creature in the geyser’s area must make your spellcasting DC Dexterity saving throw, taking 6d6 fire damage on a failed save, or half as much damage on a successful one.
• A tremor shakes the land in a 60-foot radius around you. Each creature other than you on the ground in that area must succeed on your spellcasting DC Dexterity saving throw or be knocked prone.
• Volcanic gases form a cloud in a 20-foot-radius sphere centered on a point you can see within 120 feet of it. The sphere spreads around corners, and its area is lightly obscured. It lasts until initiative count 20 on the next round. Each creature that starts its turn in the cloud must succeed on a DC 13 Constitution saving throw or be poisoned until the end of its turn. While poisoned in this way, a creature is incapacitated.