Those Familiar Spirits who take the form of the Rat tend to be about 8 to 10 inches long, not including its tail, and weighs between 1 and 2 lbs on average. Rats have an extremely keen sense of smell, especially when it comes to other animals or food. This grants them a +5 bonus to Perception skill rolls based on smell and to Tracking skill rolls. Rats are also able to burrow through normal ground at a rate of 1’ per minute. Harder packed earth would take longer and they cannot burrow through rock. Rats grant their bonded spell casters a +2 bonus to all Saves against fear, regardless of the source. Additionally, the bonded spell caster is also granted a +2 to Perception skill rolls, +3 if the Perception skill roll involved smell.