Perception

From LSWiki

Your perception is the acuity of your senses, your alertness, your ability to notice the right details and pick out the right patterns. It helps you find hidden things (and hidden people), stay on someone's trail whom you're chasing, and quickly assess and react to the situation in battle. As a component of your ability to assimilate your experiences, it helps you learn more quickly. It is also a small factor in your spell point capacity.