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A size modifier is the bonus or penalty derived from a creature's size category. Size modifiers of different kinds apply to armor class, attack rolls, Hide checks, grapple checks, and various other checks.

Note: All playable races are medium-sized, except for Gnomes and Halflings, which are small.

Note: Tiny races like Deep Gnome STILL can not use Longbow even with approriate UMD or size-changing Enlarge Person.