Wanna know who is the toughest pirate? Come and join the Chaos Argent!
Go find Chaos Administrator at (1374,529), Icicle with your Medal of Valor and pay the fee:
When the time comes, you'll find the entrance:
Then welcome to the battlefield!
If you're lucky enough, you'll find:
Open it up, wow! ^^
Here everyone is good, so please take care of yourself! ^^
After battle, you could find Chaos Administrator again with your Medal of Valor to apply to become a Chaos Overlord!
Note: please notice that for Carsise, if pirates combine the Chaos Framestone obtained in Chaos Argent with vests, the tattoo on Carsise will disappear and pirates will not able to use some skills untill remake the tattoo.