This power allows the psion to make temporary adjustments to his physical form. Such changes aren’t subtle, and are usually intended as quick offensive or defensive measures. While most psions use this power to form their fingers into knives or to turn their skin into armor, it can also be used to adjust a psion’s facial features or to modify his build. The psion cannot imitate another person’s appearance, but merely disguise the details of his own. Anyone having even a passing Familiarity with Biokinesis can readily identify when Gross Manipulation is used.