BTW, yes, autocorrect changed my Balor to Ballot. Not sure what a Balrog is in D&D.
But, again, where is this notion that the Monster Manual is showing the default? And, even if that's true, the artistic renditions of virtually every creature has varied hugely over time. How is this different?
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I guess all goblins are male. After all, that's the "default" image. And the images only show what 90% of the species is. Anything that's not in the art is a tiny minority after all.
Again, while I favor the updated marilith in the 2025 MM, this isn't an argument I can get behind either. Each of these creatures have seen drift in design over the 50 years of D&D, but don't really fundamentally change. The biggest "lore change" seen in the above art is,
do gold dragons have wings and how serpentine are they? To my eyes, at least.
You are correct that goblins, and many other creatures, usually show only (mostly?) males in the art, both in the MM books but also in supplements. And this is a problem too, IMO. But with goblins being presented as natural creatures of the material plane, it is a reasonable assumption that we have males, females and kids. Plus, it's been supported pretty well in the lore, if not the art.
I'm not sure it's been explicitly stated anywhere that mariliths are all female . . . but demons being spiritual creatures of the planes, it's easier to assume that all mariliths are all female based on the presentation in the art. But . . . unless it is stated in the monster entry, it's certainly reasonable to assume that some mariliths are male. And I'm sure many DMs over the years have made that assumption, or decided on their own way before 2025 to have the possibility of male mariliths in their game. (Same goes with medusae, hags, etc)
But ultimately, why labor to point out seemingly inconsistent arguments against the new marilith . . . when all of this is subjective to personal taste? Yes, some of the more conservative
"don't change my marilith" arguments aren't super logical and boil down to 1) preference for tradition over change and 2) rejection of (the need for) increased inclusivity in the game . . . I think it kinda begins and ends there.
I prefer tradition over change (usually), but feel very much that D&D needs to adapt to the times and become significantly more inclusive. So, I'm stoked over these types of changes that, to me, are lore "tweaks" (as opposed to substantive changes) and go a lot of distance in making the game more inclusive.
But I have a lot of friends who, like some posters here, struggle to accept the inclusivity issues of the game and really, really, REALLY value canon and tradition. Their insistence that,
"well, it's always been this way and should stay this way" I find weak and . . . well, I feel that's all the work that needs done in the argument. One "side" isn't ready for change for inclusivity's sake, and the other "side" is . . . hence the post count well over 1K with no real progress in the argument on either "side".