Ah heck but I lack creativity! Give me a day or two to think of something 

The moon garden took a good 2-3 weeks to write, by the by. Most of my ideas take at least ~5 hours of work.

It occurs to me that since you made a request of me, it's only fair that you write up a biome concept of your own now, no? c:

I definitely noticed that theres more to those ideas than what someone may be able to see at first glance. For story design, adding those dimensions are what captivates people. Or at least that's what captivates me.

Likewise. Black and white stuff is boring because you're basically shoeing a good idea in essence into this box without diverging from it. It's unnatural and pretty much everything in said box has been used in 50 different ways. The ethos of Mythruna always seemed to encompass something deeper than that which is one of the reasons why i admire it so much.

Not really anything you can do about it until I put a new graphics card in it and turn it on.  Sorry.

Inb4 Tamarie breaks into your house, graphics card in hand, and installs it under the cover of night.

And bills you for it.

There. Musical beaches are happy right?

Real talk though, I don't think of the prior ideas as sad or depressing. Bittersweet maybe, but there's good in all of them. The blood meadows aren't the safest for example, but they're still a haven if you're the right creature. Just, the player isn't necessarily the right one. There is happiness and satiety given to the inhabitants of blood meadows all the same. The sea echo curse preserves the before of tragedies, yes, but it's also actively working against the dark circumstance of its existence by preserving a glimpse of happiness and prosperity -- the tragedy never coming for these spirits.

Musenka coasts

A unique and rare form of beach, host to strange and remarkably musical life. The musenka beach contains the maracharas and penkbills as well as bobonga, xylphrass, hum weed, and thesia mushrooms. There also tends to be a number of tropical flowers and other flora around the area, with these more exotic plants and animals being mere additions to the standard fare. The nature of Musenka coasts attracts entertainers from far and wide, and a Musenka coast is often a prime location for a festival.

Marachara

A large form of hermit crab that stands at about waist height if you include its colorful spotted shell. They can be tamed, albeit slowly, by feeding them food. They'll pick away at just about any kind of food, but have a distinct preference for fish and soft fruit. Inside their claws are rattles which are usually used to ward off would be predators, but with training, you can probably teach them to play certain melodies.

Penkbill

A strange and bulky flightless bird with a short, thick neck and a comparatively massive and extremely wide duck-like bill. Their bill is surprisingly durable, and would-be predators would do well to stay away from an angered Penkbill. When they aren't feasting on beach grasses and fruit, Penkbills tend to amble along the beach looking for beached marine life to push back into the water, using their bills as leverage devices.

Bobonga

A kind of white trunked fruiting palm tree that drops strangely percussive coconuts. It has large bulbs around its trunk, kind of making it look like the tree is a stack of coconuts itself. The tree intermittently makes sounds one would expect hide drum to make, and by using fruit of various sizes from bobongas, one can make an instrument.

Xylphrass

A strange variety of cat tail, the fruiting body of this sturdy grass is dense and 'dinks' when struck or run through. Accordingly, they are often harvested and used to craft basic instruments, most often in the form of a keyboard that is struck with a mallet.

Hum weed

An extremely durable and difficult to cut grass, hum weeds, curiously, make sounds when they are rubbed, and can be used to create a massive variety of stringed instruments. Some more exotic musicians around the lands swear by hum weeds because of their unique sound as compared to traditional strings.

Thesia Mushroom

An at-first unassuming mushroom, this large portabello-like fungus has a strange psychedelic effect which is enhanced by music and other sounds, causing bursts of color to go across the screen.

oh crap happy biome uhhh uhmmm

The spam...

Sea Echo

A third cursed/blessed zone, a sea echo is a biome that, when entered, would look like a slightly more monochrome area underwater, though with the surroundings being lightly affected by what seems to be shockwaves bending light itself. From the outside, there may be a soft barrier or somesuch, though the specifics of what could be done on the border of this biome elude me. Unlike the bastions of life and death, the moon gardens and blood meadows, sea echoes are most in tune with spirits... or, at least, what seem to be spirits. Most of the creatures and plants here are ethereal, and this place is a rather potent life energy sink, with some areas being much worse than others. Introducing corporeal plant life can lessen and even negate this effect on a local level if one deigns to put in the effort. It may be that there are ethereal blocks which can be collected as well, echoes of the buildings and lands that once were.

Regarding how they come to form, I imagine it would be because of some sort of massive, rapid loss of life... so the echoes would reflect some kind of tragedy. For instance, in one iteration of this biome, the actual terrain has a massive crater, but echo blocks fill it in and show a city instead. Or, a city of echos stands, but all the floors and the ground around them are coated in ash to this day. Or, in some instances, there really is a flooded city of echoes, replete with coral and other manners of marine life. Wind will not blow, and the sun or moon will not seem to move while you are within. Time in a sea echo is static and generated with the creation of the biome -- in principle, it reflects the approximate time of the mass death.

Blood meadows

A cursed/blessed biome not unlike the moon gardens, but... it's fleshy, there are no trees, the moon rises red, the daytime sky is red, and the sun is blackened by a dark energy coursing through the sky... In fact, the sun looks like the pupil of an eye in the sky. Creatures that would otherwise be inhibited during the daytime like eclipsids are able to roam freely, so it's not necessarily the safest place. It wouldn't necessarily be an evil or disgusting place, but it would preserve and fortify magicks surrounding the dead.

I particularly like that you chose not to intrinsically make this place evil. It's like perceiving death and darkness as a type of nature rather than as evil.

I always thought of things being intrinsically evil to be kind of silly, tbh. Doesn't matter what you are, you're more likely than not just trying to get by. I'm saying this while currently writing up some seriously evil boss mob concepts, naturally.

Blood meadows

A cursed/blessed biome not unlike the moon gardens, but... it's fleshy, there are no trees, the moon rises red, the daytime sky is red, and the sun is blackened by a dark energy coursing through the sky... In fact, the sun looks like the pupil of an eye in the sky. Creatures that would otherwise be inhibited during the daytime like eclipsids are able to roam freely, so it's not necessarily the safest place. It wouldn't necessarily be an evil or disgusting place, but it would preserve and fortify magicks surrounding the dead.

Angel's Curtain

A truly gargantuan sea creature enveloped in lightly colored flowing fins that, as the name implies, looks similar to a curtain from the right perspective. Sans fins, it would likely have a somewhat vertically short body with a flattened top. I imagine the fins on top taking on a bushier appearance, with the edge of the top protruding to the sides to form what may look like wings. The tail has a flattened and elongated fin that trails behind it as it swims. Underneath an angel's curtain is its namesake bouquet of long, flowing fins, long enough to completely veil a galleon. Behind this curtain is a large lamprey-like mouth. They do not need to eat often and can most often be found simply drifting along. Curiously, these creatures are able to and often do effortlessly consume entire sunken ships, spiriting it and the dead in it away like an angel would.

Engaging in combat with an Angel's curtain, one will find that those flowing fins are in fact lined with sharp spines that will tear through unprotected flesh and damage armor, though barring an attacker being shaken off they are vulnerable to combatants that get in close. They can also suck attackers into their mouths and crush them, which is devastating and usually fatal. They are also capable of performing a death spin of sorts, which would push attackers away and deal heavy damage to foes that are too close or that are knocked off in the process. When slain, they will begin ejecting as many of their most recently consumed items as possible, though their meat and fins may be harvestable to some end.