Although a creature
and species determine many of its traits and abilities
, GMs are encouraged to alter a creature
's physiology, behavior, abilities
, tactics, and defenses when it serves the story or to confound players who think they know everything about their opponents.
The rules provided allow GMs to build custom monsters and ascribe special qualities to them. When designing a creature, the GM should also think of ways the creature can be defeated. From the heroes' point of view, a creature's weaknesses
are more important than its abilities
. Assigning weaknesses
gives under-powered or poorly equipped heroes a fighting chance.
Table: Sources of Weakness
lists many sources to which a creature
may be vulnerable. A source can be a specific object, location, substance, sound, sensation, or activity. How the creature
interacts with a source of weakness is left up to the GM, although most sources must be in close proximity to the creature
(if not touching the creature
) to affect it. GMs may roll randomly on the table, choose a source that suits the creature
, or devise their own.
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