Skill Check
Skill Checks are utilized during certain gameplay mechanics, including spells and other similar abilities. They consist in rolling the white dice as many times as the primary skill, and depending on the successes you get, something will happen. The effects vary on the spell and the ability. For instance, the spell Detect Lie uses Social Skill Checks, and for each sucess, determines if someone is lying or telling the truth.
Roll dice equal to the Rank of skill: Mind, Reflex, Body, Luck, & Social. Check the successes, and something interesting may happen.