The hook stops on contact with an enemy or terrain or when it reaches max range, then retracts after a moment.
If the hook hits nothing, its cooldown is reduced to 1 second.
If the hook hits an enemy, it inflicts 1 base damage. When hit via a melee weapon, enemies snagged by the hook are stunned for 1 second and take additional damage, dependent on the skill's own stats.
The hook retracts back toward the player, dragging any attached enemies along with it, but detaches from those that collide with terrain on the way to the player.
Heart of Ice as it can reliably trigger the mutation.
Brutality/Tactics to 
Brutality.
Grappling Hook
True Ending spoiler (5 
