You do not consume Ammo for 1.5s after hitting an enemy with Poison Bolts.
Level 3
Confound
Poison Bolts
Reduce the Cooldown of Smoke Screen by 1s for each enemy hit by Poison Bolts.
Level 2
Poisoner
Poison Bolts
Reduce the Cooldown of Poison Bolts by 3.2s.
Level 4
Twilight Armor
Armor
Increase your maximum Ammo by 6.
Level 3
Preparation
Armor
When activating Hidden, refill Wrist Crossbow's Ammo. While Hidden is active, reduce the damage you take by 75%, but reduce the maximum duration of Hidden to 3s. The duration of Hidden cannot be increased.