Engrave Chest - Slaughter from the Shadows
Client records describe this reading. They do not confirm availability in gameplay.
Current client record
Engrave your chest or robe with the Slaughter from the Shadows rune: Reduces the Energy cost of your Backstab and Ambush abilities by 30, and increases the damage they deal to non-player controlled targets by 60%. Does not apply to abilities learned from other runes.
Sourced change history
No changes in the tracked log could be matched to this record. This does not mean the ability or item has never changed.