Here is a list of all my ideas for the future of the spar arena:
There could be some sort of 2v2 match where you and your other teammate have to fight against other 2 players so it’s kinda like a duel spar.
There could also be guild spar which would be the same thing as the duel spar suggestion but instead with your guild you can fight against another guild for practice.
If you want to have an equal fight then a spar where both the players have the default tools and armor on to create a equal fight. It could be called Equal Spar or something like that but this idea may not work because players may go into their inventory to change armor.