Hey again,

I fixed the join command bug, you can't join another arena when you are in-game now
This bug was reported by @Dixizer , thanks for reporting!

The global placeholders are not available in the help menu too (only {player}).
A message is added too, called "already-in-game" under the player section, for the join command.

PS: A top command is coming in the next update!

Greetings, Jurian