This is updated Siren Lvl 60 Ricochet Witch Vex build, that can solo Mayhem 20 and new Takedown.
All included items and skills/specializations can be seen here: postimg.cc/gallery/qMyTfz5
You get 12 god roll items (9 essential and 3 swap/optional items)
Firmwares: 3/3 Deadeye with Heimdahl equipped (or 2/3 if not) and 2/3 Active Fire (or 3/3 if Draupner is equipped)