Affinity

Description
Affinity is a person's ability to be good or bad at something. "Every creature is born with a predisposition to be good at some things and bad at others" (Xuetrix, Chapter 1)1. Affinities are tied to skills, and having a low affinity in a skill means that you may never improve in that skill, whilst having a high affinity means that you will level up very quickly.

References/Appearances

 * Richter's Limitless gives him a 100% affinity with any skill he decides to practice.