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If cast on an enemy:
The Engineer fires at the target, dealing physical damage. Every combo point increases the damage dealt by the ability by 10%. At maximum combo points, the critical damage dealt by the ability is increased by 50%.

If cast on a turret:
The Engineer remotely buffs a turret. Its next three shots deal 10% more damage.

Each combo point increases the buffed turret's damage by 5% and the number of empowered shots by 1. At maximum combo points, the turret's attack range is also increased.