Should we make both corporeal and incorporeal versions, or simply note one or the other as an underbar?
Whoa! <slams on brakes>
A Gargantuan creature with 2 HD?
Oh, wait. <Sees Space/reach, calms down>
If we're going to call it Gargantuan, the space/reach should be bigger!
Frankly, I don't think these are so interesting as the small version, but I could see doing a "single zombie" and a Gargantuan lost soul. I'm not particularly fond of these as just being advancements of the same monster; they ought to be quite different (and I'm not sure advancement would work so well over such a large HD and size range anyway).
I feel like there are some other big agglomeration type undead we should look at for comparison.
Good points, freyar.
Perhaps we should stat out several sizes (like skeletons, zombies, elementals) to account for various combinations?
I'd rather just have them advance by merging. It would be less confusing than having "triple-merged Large lost souls" and the like.
That's alot of work for the DM. I think it best if we stat 'em out at different sizes, and find a way to make the assimilation fit that model.
Sure, that's fine.
A good example of blending both methods is the nabassu in Fiendish Codex I: Hordes of the Abyss.