Rogue capture skill is bugged and can accumulate infinite skills with 2 or more rogue.
You cast ground skills that rogue skill capture works on, and hold it, you get another rogue throw more skills, and the first rogue throw his captured skills and the 2nd rogue captures previously captured skills and those just cast. Wait 3min rinse and repeat.
Video of how to do it: https://www.youtube.com/watch?v=bYcXRAd8-Jc