I have pushed these changes to Git. Hope I did it right! Arena pop requirement now at 3 instead of 6. EDIT: Construction was wrong tech for introducing Arena. Now placed at Masonry in Ancient era which is a better placement. Fighting Pit in Preh Era, Arena in Ancient, and Coloseum in Classical. Better line of progression for this Building chain. BUT... I really don't like Arena going Obsolete with Colosseum. They co-existed for a long time and should show that in C2C.