Playstyle: Hold leftclick on enemies and watch them die. If you have more points after those, go for resists in this order: Fire > Stun > Cold > Lightning. After that, toss a point into Shadow Strike, then everything into Veil of Shadow until you cap that, then do the same with Pneumatic Burst (but get Breath of Belgothian immediately). Stick a point in Dual Blades, and everything else into the bar until you hit mastery 5, then 1 in bar, and 2 in Belgothian's Shears each level until you max Shears and have level 10 mastery.
You should have level 10 Mastery bar, 16/16 Fervor and 1/1 Dreeg's Reproach with a point left over when you hit level 10. Skills: I started with Oathkeeper, and just turbo charged Righteous Fervor for the first 9 levels. Probably could have leaned a little more into Phys (like 15P/8C instead of 11/12). Attributes: Pretty much and even split between Phys and Cunning. I got some really lucky drops, but some pretty sub-optimal routes (lots of having to backtrack to get around the randomly placed "roadblocks"). This Dervish cleared the content in 2h18m, and that was a test run, with almost no practice on the build. So far, I've discovered one build that can handle the FG bosses, but there are probably others. This includes: glitches that break character progression (acquiring additional skill, attribute, devotion points), infinite buffs, or lowering FPS to bypass obstacles. Tech that is considered to be a major glitch within the community cannot be used in this category. (This was created BEFORE the Veteran difficulty buffs, so probably don't try veteran unless you're a masochist.) Normal or Veteran difficulty, switching mid-run is allowed. Any number of blueprints may be unlocked prior to starting the run. Items, components, and materials found by different characters cannot be used for any reason. Run must be done alone, using a single character. Timer starts on first character movement and ends with the death of the Manifestation of Korvaak. I got asked a lot of questions about the route/gameplan in my speedrun thread, so I decided to write a little guide with some images to help others absolutely dominate my times. WARNING: Massive Wall of Text and Images! If you prefer video, here's the video guide: Formatted for Reddit, so pardon the weird bits: