​Grandshelt Colosseum is an optional side activity in Final Fantasy Resonance that’s well worth taking on. There are 20 battles spread across four Leagues, each getting harder and harder until you’re facing some of the toughest boss battles in the game.
Here’s everything you need to know about how to beat the Colosseum, including a few tips to help you out in some tough boss fights, and the rewards you can earn, like the Ancient Greatsword and Super Ribbon.
For a full breakdown of each fight, visit - https://www.ign.com/wikis/final-fantasy-resonance/Grandshelt_Colosseum_-_Battle_Guides
Timecodes:
0:00 - Intro 
0:39 - Covering the Basics
1:22 - Fledgling League Tips
1:32 - Fledgling Battle 3 Line Up
2:17 - Fledgling Battle 5 Line Up
3:16 - Tips and Tricks for Brawler and Gladiator League
4:38 - Champion League
5:18 - Champion Battle 1
7:13 - Champion Battle 2
10:34 - Champion Battle 3
12:25 - Champion Battle 4
14:40 - Champion Battle 5
17:34 - Outro