Custom Engineering Passive 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.
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Custom Engineering is a Demon Hunter passive skill, unlocked at level 40.
In-game[]
For Caltrops, both the active and inactive duration is doubled.
Primary Skills
Hungering Arrow • Entangling Shot • Bolas • Evasive Fire • Grenade
Secondary Skills
Impale • Rapid Fire • Chakram • Elemental Arrow
Defensive Skills
Caltrops • Smoke Screen • Shadow Power
Hunting
Vault • Preparation • Companion • Marked for Death
Devices
Fan of Knives • Spike Trap • Sentry • Vengeance
Archery
Strafe • Multishot • Cluster Arrow • Rain of Vengeance
Passive Skills
Thrill of the Hunt • Tactical Advantage • Blood Vengeance • Steady Aim • Cull the Weak • Night Stalker
Brooding • Hot Pursuit • Archery • Numbing Traps • Perfectionist • Custom Engineering
Grenadier • Sharpshooter • Ballistics • Leech • Ambush • Awareness • Single Out