So things you will need are:
-Good Patk and Critical;
-Good Gaia sylph;
-Minimal starting rage +21 (the more, the better), legendary gear which gives +10 extra rage on every turn;
-And a skill set similar to mine (see picture below)
So my rotation goes like this:
- First two runs I equip only Arrow Strike, Multi-Shot and Delphic Sniper and let it play on AFK mode;
- At start of third run I have 100 rage so I do Delphic Sniper first then I immediately enter sylph mode and spam Short Circuit skill. After Short Circuit I use Gaia's Delphic- Thunder Strike, then Thundering Strike until the boss kills me;
- After the third run I do the same rotation as first two runs but this time only one run, so I do normal rotation once then I go Gaia rotation on the next run and I repeat this until the end of the WB and for now it gives pretty much great results;
Note that if you don't get many criticals you may not be able to repeat Gaia rotation every second turn, if you are unlucky just do normal rotation two runs and then continue with Gaia rotation.
Hope this will help you and don't forget to check my blog for new posts ^^
All the best, Manoric!