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The Database has not been updated for the non-MMO version of the game, and likely won't be.

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.