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Grasping hand creates a Large magic hand. A grasping hand is 10 feet long and about that wide with its fingers outstretched. It has as many hit points as you do when you're undamaged, and is AC 20 (–1 size, +11 natural). It takes damage as a normal creature, but most magical effects that don't cause damage do not affect it.
The hand never provokes attacks of opportunity from opponents. It cannot push through a wall of force or enter an antimagic field, but it suffers the full effect of a prismatic wall or prismatic sphere. The hand makes saving throws as its caster.
Disintegrate or a successful dispel magic destroys it.
The grasping hand gets one grapple attack per round. This attack does not provoke an attack of opportunity. Its CMB and CMD for grapple checks use your caster level in place of its base attack bonus, with a +10 bonus for its Strength (31) score and a +1 bonus for being Large (its Dexterity is 10, granting no bonus on the Combat Maneuver Defense). The hand holds but does not harm creatures that it grapples. Directing the spell to a new target is a move action. The grasping hand can instead be directed to bull rush a target, using the same bonuses outlined above, or it can be directed to interpose itself.
This floating, disembodied hand then moves to remain between the two of you, regardless of where you move or how the opponent tries to get around it, providing cover (+4 AC) for you against that opponent. Nothing can fool the hand—it sticks with the selected opponent in spite of darkness, invisibility, polymorphing, or any other attempt at hiding or disguise. The hand does not pursue an opponent, however.
Any creature weighing 2,000 pounds or less that tries to push past the hand is slowed to half its normal speed. The hand cannot reduce the speed of a creature weighing more than 2,000 pounds, but it still affects the creature's attacks.