An [Atterax] crit build without [Maiming Strike]!
[Relentless Combination] along with status chance and attack speed allows you to hit 4.0x combo multiplier within seconds against tanky enemies, and easily get to 5.0x+ in high-level survival missions. Along with Blood Rush, even for us poor peasants without spin-to-win you can do great damage.
Here is an example of this build attacking 8 level 80 corrupted heavy gunners, going from 0 to 3.5x in under 10 seconds. With higher-level enemies or more grouped enemies that allow for more slash procs at once, this will rack the combo counter up even faster.
Note: [Primed Reach] is included for usability, especially since this build relies on hitting as many enemies at once as possible. I highly recommend it, but if you don't care for it, you can replace [Primed Pressure Point] and [Primed Reach] with [Sacrificial Pressure] Point and [Sacrificial Steel] to get to red crits quicker. [Primed Pressure Point] can be replaced by regular [Pressure Point] if necessary, but don't bother with regular [Reach]: you might as well go with damage.