SRD:Compression

This power causes instant diminution, halving your height, length, and width and dividing your weight by 8. This decrease changes your size category to the next smaller one. You gain a +2 size bonus to Dexterity, a –2 size penalty to Strength (to a minimum effective Strength score of 1), a +1 size bonus on attack rolls, and a +1 size bonus to Armor Class due to your reduced size. If your new size is Tiny, you have a space of 2 1/2 feet and a natural reach of 0 feet (meaning that you must enter an opponent’s square to attack). If your new size is Diminutive, you have a space of 1 foot and a natural reach of 0 feet. This power doesn’t change your speed.

All your equipment, worn or carried, is similarly reduced by the power. Melee and projectile weapons deal less damage. Other psionic or magical properties are not affected by this power. Any affected item that leaves your 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 effects that reduce size do not stack, which means (among other things) that you can’t use a second manifestation of this power to further reduce yourself.

Augment: You can augment this power in one or more of the following ways.

1. If you spend 6 additional power points, this power decreases your size by two size categories. You gain a +4 size bonus to Dexterity, a –4 size penalty to Strength (to a minimum effective Strength score of 1), a +2 size bonus on attack rolls, and a +2 size bonus to Armor Class due to your reduced size.

2. If you spend 6 additional power points, you can manifest this power as a swift action instead of a standard action.

3. If you spend 2 additional power points, this power’s duration is 1 minute per level rather than 1 round per level.