The best strategy that I have found for killing skolas is as soon as you head out go left kill the servator the. Lay into skolas till he gets close but far enough to escape to the left go to right side up on the platform kill adds then servator lay into skolas more keep doing so killing adds then hitting skolas till the chains break then clear adds completely rotating the devour between you as needed then rotate to the left side again easy way is always run to the left always kill servator lay into skolas till either adds space or both adds and mines then get clear mines while staying alive from adds and trying to clear them get the first set of mines done then keep up the rotations add clearing and skolas hitting till the last set of mines spawn usually when he's below a quarter of his health they will spawn clear those then it's easy sailing to kill skolas you can easily rotate the devour and kill adds and skolas without worry other than getting killed just keep pounding him from the right side platform staying neatly hidden when they attack behind the two walls on the platform good luck killed my skolas :)