Peacock River cave is hardest cave in game. You must have very good team to finish it. When you finish it, you get Reputation Points for Dodge set, and Bloodstain Chips for CS set. Inside of cave you will see NPCs (Non playable characters) where you can buy set after getting enough recourses.
PRC Dodge set
For Dodge set you will need Reputation Points. Each full cave run you will get 15.000 Reputation Points (after accomplishing quest). For 1 Reputation level you need 140.000 Reputation Points. You will need 10 times to finish it to reach next Repu (Reputation) level (10 times is 150.000 Repu points).
Full cave runs for each Repu level
Repu level 1 to 2…10 runs (150.000 repu points)
Repu level 2 to 3…9 runs (135.000 repu points)
Repu level 3 to 4…9 runs (135.000 repu points)
Repu level 4 to 5 …10 runs (150.000 repu points)
Repu level 5 to 6…9 runs (135.000 repu points)
Repu level 6 to 7…9 runs (135.000 repu points)
Repu level 7 to 8…10 runs (150.000 repu points)
Repu level 8 to 9…9 runs (135.000 repu points)
Repu level 9 to 10…9 runs (135.000 repu points)
Repu level 10 to 11…10 runs (150.000 repu points)
It is all together 94 runs. If you do one run per day (daily) you will need 94 days.
Remember: Each repu level needs 140.000 Repu points! This is just maths.
PRC CS set is much harder to get. You need Bloodstain Chips and Dodge set (You must exchange Dodge gear to get CS). You can exchange with quest at same NPCs where you got your Dodge set.
VERY IMPORTANT! If you combine your Dodge gear to +10, BUY ANOTHER dodge gear +0 and place it on your 1st place in item box for exchanging! So you don’t lose your +10 gear when you exchange!
Each full cave run gives you 10 Bloodstain Chips. Also you can drop more chips inside cave. On first boss in PRC you can drop 1 chip if you dice more then your team. On second boss you can also get 1 chip if you dice more then your team.
Bloodstain Chips also can be droped in CWC (Chill wind cave).
There is 50% chanse to drop it on 1st boss, 50% chanse on 2nd boss, and 100% chanse on 3rd and last boss. So time to get full CS set depends on you. For each gear you need different amount of chips.