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Arcane Focus

Marks enemies in the immediate area. Mark increases in power as the marked target is hit. After reaching max power or after 8 seconds, the mark explodes, dealing damage based on the power of the mark.
Upgrades
Level 1: Increases explosion damage by a moderate amount.
Level 2: Increases effect radius of Arcane Focus.
Level 3: Deals a small amount of damage each time you hit a target with Arcane Focus.