Action Points

Action Points are spent to perform many actions, including: You receive 1 Action Point per 15 minutes, even if you are not logged on.
 * Discovering new Excavations.
 * Traveling to, from, and inside of Excavations.
 * Resting (to reduce Fatigue and regain Hit Points).
 * Excavating Artifacts.
 * Using special attacks in fights against monsters.
 * Using some items.

You may not gain above 100 Action Points in this way (any extra gained above 100 are lost), however AP gained through other means, such as the "Scientific Method" Knowledge, may take you above this maximum.