You do not consume Ammo for 2.5s after hitting an enemy with Poison Bolts.
Level 5
Cloak
Hidden
Increase the duration of Hidden by 1s.
Level 1
Healing Vapors
Smoke Screen
Heal for 375 over 2s while in Smoke Screen.
Level 3
Twilight Armor
Armor
Increase your maximum Ammo by 8.
Level 4
Poisoner
Poison Bolts
Reduce the Cooldown of Poison Bolts by 1.6s.
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.