Stat Up

The Stat Up skills are a common line of simple stat buffs that come in multiple ranks and strengths.

Official description
The following is a template for the Stat Up range of system descriptions, with [bracketed content] being replaced by the appropriate stat name, buff increase, and duration. "Target’s [Stat here] +[buff]% (immediate effect, similar and identical skills cannot be stacked), duration [## minutes]"

Effects
The Stat Up range of skills apply a simple percentage buff to a single stat for a fixed duration. They cannot be stacked with similar or identical buffs; this means other instances of the Stat Up range for that stat, along with similar direct stat percentage-increase buffs, cannot be applied at the same time one of these skills is.

Variants

 * Strength Up : Increases Strength.
 * Agility Up : Increases Agility.
 * Mentality Up : Increases Mentality.
 * Mana Up : Increases Mana.
 * (presumably) Stamina Up : Would increase Stamina.

Ranks
Presumably, the percentage value and/or the skill duration rise as the rank of the skill rises.
 * At E-rank, these skills give a +5% boost for 30 minutes.

Known holders

 * Han Yoojin (pre-regression: Strength and Agility Up; post-regression: Mentality and Agility Up; initial skills)
 * Bak Yerim (potential, Mana Up, optimized skill)

History
Han Yoojin receives the E-rank skills Strength Up and Agility Up upon Awakening, which combined with his F-rank stats just barely qualify him to be a Hunter.

Synopsis
Han Yoojin notices upon re-Awakening that his Strength Up skill has been replaced by the Mentality Up skill. Due to his other significantly more powerful skills, however, his two initial skills have since gone unused for the vast majority of the story, if not the entirety of it.

Han Yoojin notices upon using My Brat Is The Best on Bak Yerim that she has the potential to get the B-rank optimized skill Mana Up.