I would like to suggest a new building on the map: A training hall.
In this place we could set our own enemies, their star and power rating and spar our own teams against them. At the end of each fight would be no rewards, but a detailed report of damage done and received etc.
Especially for arena I’d like to test out my team compositions against various matchups. A training hall would be great for that!
This is pretty clever. Reminds me of the training modes in some of the old school beat ‘em up games! I was just about to post something similar, but I was thinking more along the lines of utilizing the Guild Menu & being able to spar against our guildies’ Coli/Arena teams to - as you’ve said - test out our team compositions.
I know sparring was implemented for us to test out 5v5 fights, but if PerBlue were to take this to the next level - being able to test 15v15 - that would be amazing!
(Example Below; Please excuse my terrible photoshopping abilities 
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Whether it’s only in-guild sparring or a sparring hall building, I’m fine with both! As long as I don’t need to ask in global chat anymore “Can anyone post their team? I need to test something”
