Rewards: Command execution on completion

[SlimeCody]

A command execution on completion of the dungeon

https://cdn.discordapp.com/attachments/612148257854062593/660269306814267416/unknown.png

Upon completing the dungeon the command is executed as a reward rather than having to use the rewards chest because there is no guarantee the player will open it, even if I make it super obvious.

[Sataniel98]

I'll add something like this.