Nightbot isn’t built with Discord in mind, the only support NightDev guarantees is with the roles sync.
But I’ll help you with that one; basically, to know exactly what to use to trigger the command, you need to type the emote, and once it appears in your text box, put a backslash (\) before it, send the message, and then you’ll see what bots see, copy that and use it as the trigger.