Rat

Rats are omnivorous pests found in all climates where humans live. Normal rats attack as a swarm; each point of damage done to the swarm reduces their numbers by one animal. Giant rats are scavengers, but will attack to defend their nests and territories. A giant rat can grow to be up to 4 feet long and weigh over 50 pounds. A single giant rat, or a small group of up to four, will generally be shy, but larger packs attack fearlessly, biting and chewing with their sharp incisors. Any rat bite has a 5% chance of causing a disease. A character who suffers one or more rat bites where the die roll indicates disease will sicken in 3d6 hours. The infected character will lose one point of Constitution per hour; after losing each point, the character is allowed a save vs. Death Ray (adjusted by the current Constitution bonus or penalty) to break the fever and end the disease. Any character reduced to zero Constitution is dead. Note: The XP award for normal rats is for driving away or killing an entire pack of normal size. If the adventurers are forced to flee, the GM should award 3 XP per rat slain.