[Afentis] is something of a dumpster fire when it comes to actually using it as a weapon on Steel Path, so this build is PURELY used to make its alt fire buff come out as fast and as often as possible.

Maxed fire rate - important for throw speed
Maxed reload speed - it HAS to reload after alt fire, even if you switch weps and restore ammo passively
Max projectile speed - not super necessary but it hits the ground 0.01 seconds faster.
Arcane - Use Fractalized Reset for better reload speed, or Primary Dexterity if you want the melee combo duration.
Riven - As you can probably guess, you want fire rate, reload speed, and projectile speed.

Other notes: [Amalgam Serration] for Sprint Speed passive, and [Aero Periphery] for aim glide sleep passive purely because you have the extra slots.