Splicer Key

Splicer Key is a consumable introduced in Rise of Iron.

Source
A Splicer Key can be obtained through defeating certain Hive or Devil Splicers in Plaguelands patrols and Rise of Iron missions. Defeating a Hive Brood Mother Witch, Blood Enforcer Hive Knight, or Splicer Emissary will always cause a key to drop, provided the player performs the killing blow on the enemy and that the player does not have 10 keys already.

Usage

 * 1) Splicer Keys can be used at the Archon's Forge for re-entry after respawning during the event.
 * 2) A Splicer Key can be used to open doorways blocked by lasers; inserting a Splicer Key in a monitor located near the walls will disarm the lasers and allow safe passage. The next room will contain some Fallen, an Iron Battle Axe and two Loot Chests.