Command all dragons

You speak any number of commands to a dragon within range. The target must follow the command. Choose the command from these options:

Approach. The target moves toward you by the shortest and most direct route, ending its turn if it moves within 5 feet of you.

Drop. The target drops whatever it is holding and then ends its turn.

Flee. The target spends its turn moving away from you by the fastest available means.

Grovel. The target has the Prone condition and then ends its turn.

Halt. On its turn, the target doesn’t move and takes no action or Bonus Action.

Attack. On its turn, the target attacks a chosen creature. 

And any other commands.