Every point in this skill increases the stat bonus of items by 0.25% effectively multiplying them by 1.25 at a skill of 100. Stat Enhancement is a member of the Stats group of skills that is available at character level 20. Raising this skill at or above your character level will incur an experience point penalty. As a Stats skill, Stat Enhancement can only be raised actively, by defeating monsters and earning experience points directly. If you are using enchanting stones to add stat bonuses to equipment, you'll probably want to level Mitigated Penalties as well to reduce stat penalties conferred by the stones.