Just a quick question about it. When I activate Demon Soul while I have my Felhunter out, will my dots that already exist on enemies get the damage bonus; or will I have to renew those dots via Fel Flame, Drain Life, Haunt, etc?
Edit: I figured I'd stop being lazy and test something out myself for a change since Rellekk's reply wasn't exactly all that confirming. I've confirmed that you do not need to reapply your dots (Other than Bane of Agony(or Doom?)). They simply need to be refreshed to a higher duration, thus applying the +damage bonus to that individual dot.