Superhalloween is a set of powers that gives you the ability to use old themed pawns.
Collection powers cannot be disabled via the power list, however if you wish to disable Superhalloween you can still type /-superhalloween into the chat. Please note that if you do this the power will no longer be visible in your power list and if you want to re-enable it, you will have to type /+superhalloween into the chat.
To use the pawns, you must have at least one of each of the following powers:
More information: here