The server is called |PHD| Defend The Core!, it uses this gamemode as a base and added tons of content ontop of it

-Leveling
-Prestige
-More Classes
-Inventory system
-Loot/Cosmetics
-Quests
-Crafting
-More enemies
-Bosses every 10 waves
-And SO MUCH MORE

I plan on adding tons of new content over the weeks and fixing any bugs on release, it released as of 7/9/21

You can join here
phdesp.game.nfoservers.com:27015