https://www.youtube.com/watch?v=qsby6rYkxS8
Reaper vs Revenant (vid)
Scourge Demo Weekend Roaming Video:
https://www.youtube.com/watch?v=qsby6rYkxS8
https://www.youtube.com/watch?v=qsby6rYkxS8
From my experience playing rev, the best thing you can do is get them caught in a fear chain. Corrupt their boons and follow with staff 3 and staff 5. Staff 3 is there because of the poison field, essentially you go reaper and whirl inside it for poison stacks. Follow up by breaking your stability for another fear.
You ruin much of their potential damage simply removing might and fury from them. They gain additional crit chance and damage when under the affects of fury.
Bad Elementalist