Mercenary: Flash of Blades

 is a challenge in Risk of Rain 2. It is completed as Mercenary by using 20 abilities in 10 seconds.

Tips

 * and allow you to stack uses of secondary and utility attacks. Having enough will make this challenge trivial.
 * can also allow you to spam attacks for several seconds after killing an elite.
 * As with most of the challenges, the makes it easy to get the items you need.