This mutation grants the ability to instantly alter body density, thus shrinking or enlarging, with maximum enlargement up to twice the natural body size, and maximum shrinkage to 1/8 original body size. Each fraction of a body size change is accompanied by an equal fraction increase or decrease to armor class and speed. For example, reduction of size by 1/4 also reduces (improves) armor class and reduces movement by 1/4. Becoming twice as large increases armor class by a multiple of two (to a maximum of 9) and doubles movement. Note that reduction of body density to 1/8 makes a character impervious to damage from sharp implements.