Custom Engineering Custom Engineering
The duration of your Caltrops, Marked for Death, Spike Trap and Sentry is increased by 100%.

Increases the maximum number of active Sentries to 3, and increases maximum number of Spike Traps to 5. Also allows Sentry skill to hold 1 additional charge.

The self-loading mechanisms built into most hand crossbows and traps are delicate and difficult to maintain. Extensive practice is required to use them properly.

Custom Engineering is a Demon Hunter passive skill, unlocked at level 40.


For Caltrops, both the active and inactive duration is doubled.