the "ROTH" mod, meaning Rex of the Hill because its a funny play on words and I am a raging narciccist, adds one item and one function.
It is an admin configurable and accessible King of the Hill block where the admins can determine any reward, time, and NPC counters with a simple in game GUI and menu.
Do /roth gui , grab one of the blocks in creative as an OP, and have fun!
Comes with custom chat announcements and basically every feature configurable.

