A creature's size represents its mass and how much space it occupies. The following table lists the size modifiers, as well as some typical weights (in pounds), and typical heights (in feet). Size is more about a creature's mass than its dimensions, therefore there are examples which may fall outside these ranges.
|Size1||MUS2||HP||Typical Weight||Typical Height||Example|
|−5||−25||3||0.5–2||0.25–0.5||Bat, gray squirrel|
|−4||−20||5||2–10||0.5–1||Human infant, brown rat, cottontail rabbit|
|−3||−15||10||10–25||1–1.75||Human toddler, falcon, house cat|
|−2||−10||20||25–50||1.75–3||Lynx, beaver, border collie|
|−1||−5||25||50–100||3–5||Firna, grey wolf, cheetah|
|0||0||30||100–250||5–7||Human adult, mastiff, wild boar|
|1||5||35||250–500||7–9||Kulgeri, Gorilla, black bear, bull shark|
|2||10||40||500–1,000||9–11||Grizzly, tiger, bottlenose dolphin, alligator|
|3||15||55||1,000–2,500||11–13||Horse, bison, tiger shark|
|4||20||75||2,500–5,000||13–16||Hippopotamus, white rhino, great white shark|
|5||25||100||5,000–10,000||16–20||Juren, elephant, stegosaurus, colossal squid|
|6||30||200||10,000–25,000||20–25||Tyrannosaurus rex, triceratops, orca|
|8||40||675||50,000–100,000||30–40||Sperm whale, humpback whale|
|9||45||1250||100,000–250,000||40–60||Argentinosaurus, fin whale|
|10||50||2500||250,000–500,000||60–90||Amphicoelias fragillimus, blue whale|
|11||55||5000||500,000–1,000,000||90–150||Rampaging radioactive reptilian monsters|
- The Size gets subtracted from Attack Rolls and Evasion Rolls. Therefore, a positive number is a penalty and a negative number is a bonus. When creatures of different sizes engage in combat, the smaller one is harder to hit and inversely, the larger one is a bigger target.
- The Muscle bonus is added to Might and Grip when opposing a creature of a different size. In feats of strength, larger creatures are many times stronger than smaller ones.