SeRiAlExPeRiMeNtS said:
Ok, I was a litle over, but the unholy aura is the only thing that saves the marilith from lose a fight with a well prepared 10th level parry. And a 10th level fighter´s AC can easily be 30 so with a +13 as hers BEST attack bonus she will miss most of the time (even with 8 attacks... ). And a marilith can´t fly! a fling archer can kill her easily.
To handle the tank the marilith should grapple. She avoids most of the AC issue from armor and such, and with the large number of attacks, the PC will run out of AoOs soon enough. A tail grapple attempt will be a cinch once the other arms have a hold and the PC loses any weapon except for light as a threat. She can then constrict away and 4d6+7 is nothing to sneeze at.
Against a flying archer, she has the relatively low damage area spells such as chaos hammer and unholy blight to give her a shot beyond reach. While these will do low damage, they will likely be more reliable than his shots against her 33 ac will. Also, she can figure that eventually he will run out of +2 or better arrows or even just arrows themselves.
More to the point if she has the foresight to have some fire source around, she can sit inside a purotechnics cloud, turning the archer into a random shooter into complete concealment wqhile her projected image sits outside with an unobstructed view casting spells.
Now, in theory he can sit outside of her spell ranges, and maybe she wont have any fire sources, and if the scenario does indeed force her into such a lopsided SETUP, then the 18 int 18 wis marilith should sue the GM for non-support.
No argument that a scenario can be *designed* or *scripted* so that such a party can take on the marilith, just arguing that such ashould not be expected.
And again, if items in her treasure are useful, things can get really ugly really quick. One potion of haste means teleport without error and a tail strike and your flying archer is toast.