Empowered Gem - Stunburst
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Taking damage has a chance to spawn a ring of stunning projectiles, briefy disabling affected enemies.
— Item Tooltip

Stunburst is a universal Empowered Gem ability that works with any class. This ability is to create a ring of several yellow orbs around the player, when they are taking damage. This ring will then spread out in all cardinal and intermediate directions (north, northeast, east, southeast, south, etc.).