Trial Chambers is a PVP & PVE Map/Datapack that implements a unique gamemode based on the new Trial Chambers. You can play in Teams or in Co-Op. The Goal is to kill as many mobs or players in a given time.
First, install the datapack by downloading the zip and placing it inside the datapacks folder.
To play you just need to place the lobby structure by running the command /place template trials:new_spawn ~ ~-1 ~. Once placed you can just enter the building, select between Teams and Co-op and press the Start Game button.