Well, like I said, 1d8 or maybe 1d10 would work better for me.
Well as I said before in my last post, I'm OK with anything from 1d8 to 1d12, so let's use 1d8 for the time being.
That's the rule I was thinking of for Imp Grab.
Okay, let's rough something out:
Firstly, I'm thinking we ought to rename the attack from "sting" to "tentacles". They may have been called stings in the original, but in 3E terms a sting natural weapon is an impaling attack, which acid-dripping tentacles definitely aren't!
Secondly, I'm thinking we should limit how many tentacles it can hold an opponent with based on the target's size. Like the Darktentacles in the
Monster Manual II.
Thirdly, the Gammaroid has a +148 grapple modifier so there's no way the Noble Gossamer can beat it with a grapple check unless it has a monstrous racial bonus to grapple checks (as in at least +70!).
I'm thinking we'd be better off giving it a version of Attach instead of Improved Grab, so its sticky tentacles always adhere to prey but a Gammaroid could easily burst free with its awesome strength if it wanted to use the action for it.
We might still want to give it a racial bonus to grapple checks to help it keep hold of prey. I'd prefer a bonus based on the number of attached tentacles, but would consider a flat number.
e.g.:
A noble gossamer can use only two tentacles at once against a Small or Medium-size opponent. Against a larger foe, it can use two additional tentacles for each extra 5 feet of face the opponent has, provided that it has the reach. Against a Tiny or smaller opponent, the creature can use only one tentacle. It can use a maximum of two tentacles against all foes in any single 5-foot by 5-foot area.
Note that a darktentacles has a 50% higher tentacle density of three tentacles per 5 ft. face, but they're also a lot smaller than the Gossamer Noble!
Attach (Ex): If a noble gossamer hits an opponent with a tentacle attack, its sticky tentacle automatically attaches to the opponent. An attached noble gossamer is effectively grappling its prey, but has the option to simply use its tentacle to hold the opponent (–20 penalty on grapple checks, but the gossamer is not considered grappled).
For the racial bonus to grapple, I'd add one of the following:
A noble gossamer gains a +2 racial bonus on grapple checks per tentacle it has attached to an opponent (e.g. +6 for three tentacles).
A noble gossamer has a +X racial bonus on grapple checks (already figured into the stat block above).
Constrict (Ex): Every round a noble gossamer keeps hold of an opponent with its acid-secreting tentacles, it automatically inflicts 1d8 acid damage per tentacle that has hold of the opponent (e.g. four tentacles do 4d8 acid damage). In addition, the opponent is automatically exposed to poison attacks from all tentacles that are holding it.
Here's an "Improved Grab" version.
Improved Grab (Ex): If a noble gossamer hits an opponent that is at least one size category smaller than itself with a tentacle attack, it can automatically establish a hold as a free action without provoking an attack of opportunity. If it wins the grapple check, it establishes a hold and can constrict the opponent in subsequent rounds. Thereafter, the gossamer has the option to conduct the grapple normally, or simply use its tentacle to hold the opponent (–20 penalty on grapple check, but the gossamer is not considered grappled).
A noble gossamer gains a +2 racial bonus on grapple checks per tentacle that has hold of an opponent (e.g. +6 for three tentacles).
A noble gossamer has a +X racial bonus on grapple checks (already figured into the stat block above).