Prism
Explorer
To sumarize some of the great points made by various people this is how I now see it
Starts the round grappling
A creature can only attack with 1 natural weapon due to the quotes from the rake ability and the main grapple rules
However with a full attack you are allowed mutiple grapple attempts based on your BAB and this includes creatures with natural attacks.
They couldn't make more than 1 attack a round but they could use the other iterative attacks to perform other actions such as pin, escape, damage opponent, use opponents weapon or break anothers pin. None of these are actual attacks (they are grapple checks) and therefore are not limited by the normal rule of 1 attack only with each natural weapon
Grapples an opponent part way through its attacks sequence
The creature follows its normal full attack sequence until it grapples its opponent. At this point it is grappling and loses all remaining natural attacks. This is supported by the use of the -20 option which basically prevents the creature from being grappled itself
So if you can use your remaining attacks as a benefit when you take the -20 I can only assume you lose your remaining attacks when you don't. This would also support the quotes above which only allow 1 natural weapon when grappling. A giant octopus or such like with many attacks is probably best taking the -20 option here to keep its other attacks
I also believe that at this point the creature would get any iterative attacks based upon BAB to allow it to do additonal grapple actions, assuming it is in the middle of a full attack.
Ending the grapple part way through the grapple sequence
This could be because the opponent dies or is swallowed as an example. At this point the creature has only used 1 natural weapon in the round (possibly mutliple iterative grapples with it however) and therefore, now not being grappled anymore can use any remaining natural attacks as normal to attack other opponents - and possibly even grapple them
Creature chooses to grapple with 1 part of its body
The creatures gets iterative grapple attempts with its 1 body part and still gets its remaining attacks in addition. The -20 on the grapple checks makes this a pretty difficult option but probably worth it for multiattack creatures like the giant octopus or dragons
Starts the round grappling
A creature can only attack with 1 natural weapon due to the quotes from the rake ability and the main grapple rules
You can’t attack with two weapons while grappling, even if both are light weapons.
Normally, a monster can attack with only one of its natural weapons while grappling, but a monster with the rake ability usually gains two additional claw attacks that it can use only against a grappled foe
However with a full attack you are allowed mutiple grapple attempts based on your BAB and this includes creatures with natural attacks.
If your base attack bonus allows you multiple attacks, you can attempt one of these actions in place of each of your attacks, but at successively lower base attack bonuses.
They couldn't make more than 1 attack a round but they could use the other iterative attacks to perform other actions such as pin, escape, damage opponent, use opponents weapon or break anothers pin. None of these are actual attacks (they are grapple checks) and therefore are not limited by the normal rule of 1 attack only with each natural weapon
Grapples an opponent part way through its attacks sequence
The creature follows its normal full attack sequence until it grapples its opponent. At this point it is grappling and loses all remaining natural attacks. This is supported by the use of the -20 option which basically prevents the creature from being grappled itself
The creature 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 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
So if you can use your remaining attacks as a benefit when you take the -20 I can only assume you lose your remaining attacks when you don't. This would also support the quotes above which only allow 1 natural weapon when grappling. A giant octopus or such like with many attacks is probably best taking the -20 option here to keep its other attacks
I also believe that at this point the creature would get any iterative attacks based upon BAB to allow it to do additonal grapple actions, assuming it is in the middle of a full attack.
Ending the grapple part way through the grapple sequence
This could be because the opponent dies or is swallowed as an example. At this point the creature has only used 1 natural weapon in the round (possibly mutliple iterative grapples with it however) and therefore, now not being grappled anymore can use any remaining natural attacks as normal to attack other opponents - and possibly even grapple them
Creature chooses to grapple with 1 part of its body
The creatures gets iterative grapple attempts with its 1 body part and still gets its remaining attacks in addition. The -20 on the grapple checks makes this a pretty difficult option but probably worth it for multiattack creatures like the giant octopus or dragons
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