sudden death

Im currently making a map, and i have a separate area for when Sudden Death happens after the map timer runs out. Problem is, i have no idea how to make it so that i can spawn there specifically for Sudden Death. What brush entity should I use, and what outputs should i put in to spawn there...

I’m making a server rn and i am planning on making a separate Sudden Death area (based on SSBM FD, but I digress), and im curious on how i can do that. Ive seen another map do it, and it certainly wasn’t a server mod, so how is this done?