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Some monsters and spells have the supernatural or spell-like ability to paralyze or hold their victims, immobilizing them through magical means.
A paralyzed or held character cannot move, speak, or take any physical action. He is rooted to the spot, frozen and helpless. Not even friends can move his limbs. He may take purely mental actions, such as casting a spell with no components.
Paralysis works on the body, and a character can usually resist it with a Fortitude saving throw. Hold is a mind-affecting enchantment, and a character usually resists it with a Will saving throw.
A winged creature flying in the air at the time that it is held or paralyzed cannot flap its wings and falls. A swimmer can't swim and may drown.