Deal 350/500/800 () magic damage to the current target, then Heal all nearby allies for 30/40/50% of their missing Health, with an increased radius if the enemy dies.
Combat start: The Sentinel with the most items (ties broken by highest Attack Speed) gains a Shield that grants stacking Attack Speed. When it is destroyed or expires, it bounces to the ally with lowest percent Health and renews. The Attack Speed bonus persists between Shield bounces.