I just did it last night at 896 as BM (SV main) with no healing/defensive legendary and without any legendary working other than the new "free talent" ring. Took me about 12-15 trys. The solution was to combine a bit of all strat I found using 2/1/1/2+3/x/1/3 setup.
- use a turtle (or similar defensive pet), keep mend up at all time
- use drums after poping all your CD and potion
- cast redirect on the first adds spawn (freeze trap the one that will spawn on you), use pet defensive
- disengage (with 60% speed boost) when Fenryr is about to jump to you; if you run away from him at 50%+ speed, you will avoid to stack the bleed effects (meaning you will not take any damage)
- if your pet dies start running around the lake and rez him when Fenryr start to cast the chase (he will pause long enough to stand still to rez)
- use tar trap, dire beast and crows on CD while kiting
- when chase ends, continue to kite until he gets close to you, then redirect on pet and FD (don't FD during chase in anyway, otherwise it won't reset aggro, it costs me a number of wipes...)
- rinse and repeat
At my level I was able to get it around 25% before I had to kite (due to dead pet).