Missions Ranks

[cizar5]

1st question: I wonder what is those Letters mean; and what can I benefit from it?
2nd question: When will the Heroic stage be available ?

[cizar5]

Thanks Seldreing for ur answer, but i believe that the admins have another look; besides I want to know what exactly the Croosponding exp points and what S, A ranks like:

A= Excellent (xxxxxx exp rewarded)
S= .......

and so on!

[Seldreig]

1st answer
The letters define what amount of exp you get. I don't know if they do anything else though
2nd answer
http://forum.r2games.com/showthread....New-REVOLUTION
that is all the information they have released regarding new stuff and heroic dungeons aren't mentioned, just nightmare for multi.