Chinese C9 will release survival mode in the upcoming version. (Other new content in the version, please check this thread: C9(CN)'s Open Beta Starts On Feb 29th!)
So let us first have a look at what survival mode is. These info is according to KR version, it hasn't been confirmed whether there is something different from CN version, so it's for reference only.
There are 20 rounds in a Survival mode, you can solo or team up. Players will get a lot of rewards once finish the mode.
Except for gold and enhancement stones etc, players also can get Guild Points.
Usually GP can be gained from PvP, now it's able to obtain from Survial mode.
In survial mode, if you clear round 1 to 5, you will get 1 + 2 + 3 + 4 + 5 = 15 GP, if you pass round 6, you will get 6 GP, and so on.
Survival Mode Round 1 to 5:
When you clear round 5, there is a wood box, although the rewards in the box are random, players will probably get 20,000 gold and 3 or 4 enhancement stones. And the monsters in round 1 to 5 are those monster which appears in first continent dungeons.
Survival Mode Round 6 to 10:
When you clear round 10, you can get an iron box, although the rewards in the box are random, you will probably get 50,000 gold and 5 or 6 enhancement stones. The monsters in round 6 to 10 are those monster which appears in second continent dungeons. Since round 8, you'll find the degree of difficulty is on the increase.
Survival Mode Round 11 to 15:
When you clear round 15, you can get a grace box, although the rewards in the box are random, you will probably get 5000,000 gold and some enhancement stones. The monsters in round 11 to 14 are second continent dungeons' monsters. In round 15, there are second continent dungeons' monsters. Since round 11, it's more difficult to pass.
Survival Mode Round 16 to 20:
When you clear round 20, you can obtain a gold box, although the rewards in the box are random, you will probably get 300,000 gold and some enhancement stones. In round 16 to 20, there are a lot of monsters which haven't been released, and the monsters in round 18 and 19, are very powerful.
When you done the survival mode, you can get about 30,000,000 gold, many enhancement items and 210 GP. If you are in a team, each team member will get 210 GP.