Right, So basically my group of friends and I are brand new to DND. Recently we finished up the first section of the starter set for 5E.

There was a point in the story where one of my PC's got really creative and wanted to cast a spell called Command out of combat (while sneaking) on a boss npc, and then immediately command that boss to kill himself by shoving a javelin right into his head.

Since this was out of combat, and there were no turns, my PC's rationale was that he could these things in succession since it was part the group narration, and just had to pass a difficulty check...

I felt this was too strong, and that I was missing something from the rules since i basically just bought this box the night before..

So as a DM i stepped in and said "no you cant do that...that can't be right thats too strong" mind you I asked my PC to roll a d20 and see if he was successful, which he was.

So I feel like i overstepped my bounds because I basically said no to my PC with the one hit kill, and didn't want this boss encounter to be bypassed so easily.

So I was wondering was I in the wrong to stop my PC from doing that crazy one hit kill?

How exactly would this scenario play out with experienced players and DMs like you guys?

We are brand new to D&D. Recently we finished up the first section of the starter set for 5E.

There was a point in the story where one of my PC's got really creative and wanted to cast Command out of combat (while sneaking) on a boss NPC, and then immediately command that boss to kill himself by shoving a javelin right into his head.

Since this was out of combat, and there were no turns, my player's rationale was that he could these things in succession since it was part the group narration, and just had to pass a difficulty check...

I felt this was too strong, and that I was probably missing something from the rules since I had only just bought this box the night before.

So as the DM I stepped in and said "no you can't do that... that can't be right, that's too strong." So I asked my player to roll a d20 to see if he was successful, which he was.

But I feel like I overstepped my bounds because I basically said "no" to my player because I didn't want this boss encounter to be bypassed so easily.

Was I in the wrong to try to stop my player from doing that crazy one hit kill?

How would this situation have played out if I had more experience with the rules?