SPOT

The Spot skill will increase your ability to notice sneaky, hidden, or shrouded things. It enhances your vision. However, you must actually have a corresponding vision for Spot to enhance it.

For example, Spot would only increase your ability to spot heatshrouded things if you had infravision. Similarly, it would only increase your ability to see lifeshrouded things if your character had deadeye.

The Sixth Sense skill is an upgrade to Spot which will further heighten Spot's effectiveness.