I have a question about some interactions with this spell. The 2024 stat block Cultist Fanatic has Command and in my game I had a Fanatic cast it on a Warrior of Shadow Monk and command her to Flee.
Flee. The target spends its turn moving away from you by the fastest available means.
We got to the monk's turn and first she asked me if she could use her Shadow Arts feature to move her Darkness spell while under the Command.
Darkness. You can expend 1 Focus Point to cast the Darkness spell without spell components. You can see within the spell’s area when you cast it with this feature. While the spell persists, you can move its area of Darkness to a space within 60 feet of yourself at the start of each of your turns.
The movement of the Darkness area does not require an Action or Bonus Action, but it also doesn't technically fit to her "spending her turn" moving away from the Fanatic. Since it didn't interfere with her moving away though, I allowed it.
Next, she wanted to use her Step of the Wind feature, the version that spends a focus point to add Disengage to a Dash BA.
Step of the Wind. You can take the Dash action as a Bonus Action. Alternatively, you can expend 1 Focus Point to take both the Disengage and Dash actions as a Bonus Action, and your jump distance is doubled for the turn.
I also thought this was fine and a clever use of the monk's special ability, because otherwise she would have taken opportunity attacks from 4 different enemies she was running past. She did the BA Dash+Disengage, and also used the Dash Action. She got some distance there, and basically ejected herself from the fight.
The only thing that caught me up about this is that I'm used to Command options taking away everything in your turn except following the Command. But there is another exception to this in the spell, which is Approach.
Approach. The target moves toward you by the shortest and most direct route, ending its turn if it moves within 5 feet of you.
The way this is written, it sounds to me like if the target does not get within 5 feet of the person casting Command, it can continue its turn as normal, using an Action and Bonus Action for example.
And then with Flee, I started wondering if they have to use teleport spells to move away if they have them ("fastest available means"). But I think I can cut that line of thought off by saying "moving away" means only physically moving away. I think a wizard might be a little upset at being forced to Dimension Door or Plane Shift or something by a Level 1 spell. But I would argue the Flee target must always spend its Action on Dash, unless it has some other Action that physically moves it and is faster, to honor the "fastest available means" text.