Killing an enemy causes your Shields to quickly regenerate and increase Action Skill Cooldown Rate for a few seconds.
Melee attacks mark the target for death for a short duration.
Marked targets take additional damage from all sources.
Also, it's not an easy thing to live with.
Bonus Damage (marked enemy): +80%
Mark Duration: 8s
Killing an enemy with a Melee Attack restores Health.
The lower your health, the more health you receive.