The Crusader's Fist

From the introduction:

A Tales of the 13th Age adventure for 13th Age characters of 6th level, in five two-hour sessions.

The adventurers start the adventure in Axis, attending a gladiatorial game as guests of an icon that they have worked for previously. The day’s games are a celebration of the anniversary of the Crusader’s capture of and pacification of the hellhole at First Triumph.
Unfortunately the Diabolist intends to disrupt the day’s celebration and has smuggled some monsters into the stands. After the adventurers show themselves to be capable they are offered the job of tracking down the origin of the monsters and preventing the Diabolist from doing anything like that again.