See the user build section for builds using this weapon.
Use Cronus as a replacement to your Skana, it is easy to craft and is an overall damage boost.
The listed firing rate is a speed multiplier for longswords. The real rate is 2.2 hits per second (0.45s to hit once). This is because the firing and charge rate of melee weapons often gets skewed due to attack animations.
As of update 7.8 the Cronus Blueprint is only a guaranteed drop the first time Tolstoj is completed and the % chance for it to drop decreases each run afterward. This was put in place to prevent credit farming.