Monsters and Grappling
In general, monsters follow the same rules as PCs when conducting a grapple.
Monsters in a grapple may use their natural weapons, but only by using the “Attack Your Opponent” option (which applies a -4 penalty on the attack roll). When using the “Damage Your Opponent” option, the creature deals
unarmed strike damage appropriate to its size (see
Part 2 of this column).
Some options available while grappling (such as “Damage Your Opponent” and “Pin Your Opponent”) state that they may be used in place of an attack. The monster gets as many “attacks” in a full attack action as it would get if it were attacking with a weapon, based on its base attack bonus: +1 to +5, one attack; +6 to +10, two attacks; +11 to +15, three attacks, and +16 and up, four attacks. Each one after the first would suffer a cumulative –5 penalty on the roll (just like a character with a high BAB making multiple weapon attacks).
For example, a dire tiger (BAB +12) grappling a PC would be allowed three separate attempts to damage its opponent, escape from the grapple, or pin its opponent; the second would take a –5 penalty on the grapple check, while the third would take a –10 penalty.
Improved Grab: The improved grab special attack allows a monster to make a grab attack as part of a regular melee attack with a particular natural weapon (usually a bite or claw). If the attack hits, the natural weapon deals damage normally, and the monster immediately makes an opposed check to establish a hold. The attack doesn't provoke an attack of opportunity. Since the attack already dealt damage when it hit, a successful hold deals no extra damage. Each successful grapple check the attacker makes during successive rounds automatically deals the damage indicated for the attack that established the hold. (This works just like making a grapple check to deal damage.)
A creature with the improved grab special attack has the option to conduct the grapple normally, or simply use the part of its body it used in the improved grab to hold the opponent. If it chooses to do the latter, it takes a -20 penalty on grapple checks, but it is not considered grappled itself; the creature does not lose its Dexterity bonus to AC, still threatens an area, and can use its remaining attacks against other opponents. This is handy for really big monsters, such as giant squids and krakens.
When a creature gets a hold after an improved grab attack, it pulls the opponent into its space (rather than entering the foe's space). According to page 310 in the Monster Manual, the grabbed creature's involuntary movement does not provoke attacks of opportunity. A creature with the improved grab special attack and reach drags a grabbed foe a considerable distance.
A creature with the improved grab special attack can move without making an opposed grapple check, provided it can drag the opponent's weight. The creature's movement and the involuntary movement by anyone it drags along provokes attacks of opportunity normally.
Constrict: Creatures with the constrict special attack deal extra damage when grappling. Most creatures with this attack usually also have the improved grab special attack. A creature deals extra constriction damage when it first grabs a foe and establishes a hold. If the creature later makes a grapple check to deal damage to a creature in its grasp, it deals damage from the natural weapon it uses in the attack (if any) and extra constriction damage as well.
