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This spell causes instant diminution of Humanoid creatures, halving each individual's height, length, and width and dividing its weight by 8. This decrease changes the creature's size category to the next smaller one. The targets gain a +2 size bonus to Dexterity, a –2 size Penalty to Strength (to a minimum of 1), and a +1 bonus on attack rolls and AC due to their reduced size.
A Small Humanoid Creature whose size decreases to Tiny has a space of 2-1/2 feet and a natural reach of 0 feet (meaning that it must enter an opponent's square to attack). A Large Humanoid Creature whose size decreases to Medium has a space of 5 feet and a natural reach of 5 feet. This spell doesn't change the target's speed.
Melee and projectile Weapons deal less Damage. Other magical properties are not affected by this spell. Any reduced item that leaves the reduced creature's possession (including a projectile or thrown weapon) instantly returns to its normal size. This means that thrown Weapons deal their normal Damage (projectiles deal Damage based on the size of the weapon that fired them).
Multiple magical effects that reduce size do not stack. Mass reduce person counters and dispels Mass Enlarge Person.
Mass reduce person can be made permanent with a permanency spell.