Pesh Vigor

Transmutation
Level: Alchemist* 1, Antipaladin* 1, Artificer * 1, Bloodrager * 1, Cleric */Oracle * 1, Druid * 1, Hunter * 1, Magus * 1, Shaman * 1, Sorcerer */Wizard * 1, Summoner * 1
Components: V, S, M (a dose of pesh worth 15 gp)
Casting Time: 1 Standard Action
Range: touch
Target: living creature touched
Duration: 1 round/level; see text
Saving Throw: Will negates
Spell Resistance: yes
  The target gains a +2 Enhancement Bonus to its Strength. Once per round as a Free Action, the target can choose to increase the Enhancement Bonus by 2 for 1 round; if it does so, it takes 1d6 points of nonlethal damage and the spell's duration decreases by 1 additional round. For every 5 Caster Levels you have, the target can choose to increase the Enhancement Bonus by an additional 2, taking an additional 1d6 points of nonlethal damage and decreasing the duration by 1 additional round per increase to the Strength bonus, to a maximum Enhancement Bonus of +10 and 4d6 points of nonlethal damage at Caster Level 15th. The subject can't spend more rounds than remain in the duration. When the spell ends, the subject becomes Fatigued.