You do not consume Ammo for 1s after hitting an enemy with Poison Bolts.
Level 2
Poisoner
Poison Bolts
Reduce the Cooldown of Poison Bolts by 4s.
Level 5
Cloak
Hidden
Increase the duration of Hidden by 2s.
Level 2
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.