When Astrid's HP falls below 80%, she gains a shield that absorbs x HP for 4 seconds. The shield effect has a 24-second cooldown and will be reactivated when Astrid takes damage again. While the shield is active, it deals x magic damage to surrounding enemies. Cooldown is reduced by 3 seconds every time Astrid hits an enemy hero with an ability or normal attack and by 1.5 seconds every time she hits an enemy minion or monster.