This spell causes instant growth of a creature or object, increasing both size and weight. It can be cast only upon a single creature (or a symbiotic or community entity) or upon a single object that does not exceed ten cubic feet in volume per caster level. The object or creature must be seen to be affected.
It grows by up to 10% per level of experience of the wizard, increasing this amount in height, width, and weight. Magical properties are not increased by this spell - a huge sword +1 is still only +1, a staff-sized wand is still only capable of its normal functions, a giant-sized potion merely requires a greater fluid intake to make its magical effects operate, etc. Weight, mass and strength are affected, though. Thus, a table blocking a door would be heavier and more effective, a hurled stein would have more mass (and cause more damage), chains would be more massive, doors thicker, a thin line turned to a sizeable, longer rope, and so on. A creature's hit points, Armor Class, and attack rolls do not change, but damage rolls increase proportionally with size.
For example, a fighter at 160% normal size hits with his long sword and rolls a 6 for damage. The adjusted damage roll is 10 (that is 6 x 1.6 = 9.6, rounded up). Bonuses due to Strength, class, and magic are not altered.
The reverse spell, reduce, negates the enlarge spell or makes creatures or objects smaller. The creature or object loses 10% of its original size for every level of the caster, to a minimum of 10% of the original size. Thereafter, the size shrinks by one-foot increments to less than one foot, by one-inch increments to one inch, and by 1/10-inch increments to a minimum of 1/10 of an inch - the recipient cannot dwindle away to nothingness.
For example, a 16-foot-tall giant reduced by a 15th-level wizard (15 steps) would be reduced to 1.6 feet (in nine steps), then to 6/10 of a foot or 7.2 inches (in one step), and finally to 2.2 inches (in the last five steps). A shrinking object may damage weaker materials affixed to it, but an object will shrink only as long as the object itself is not damaged. Unwilling creatures are allowed a saving throw vs. spell.
A rowboat that has a length of 14', a depth of 2', and a beam of 4' has a volume of 112 cubic feet. A rough volume measurement for a humanoid is: height cubed, divided by 24 (h³/24).
The material component of this spell is a pinch of powdered iron.