Spell Tinkerer

Spell Tinkerer (Su; Cha): You can alter an existing spell effect by expending 1 point from your arcane reservoir. To use this ability, you must be adjacent to the spell effect (or the effect's target) and be aware of the effect. You can choose to increase or decrease the remaining duration of the spell by 50%. This ability can be used on unwilling targets, but you must succeed at a caster check in melee, and the target may attempt a Will saving throw to negate the effect. This ability cannot be used on a given spell effect more than once. This ability has no effect on spells that are instantaneous or have a duration of permanent.

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