These ones aren't so hard to see on the larger file. But it'd be weird not to do a set for them.
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Sand emperor - Fronterras oxygen-rich atmosphere has allowed even seemingly earthly arthropods greater range in their growth, with none showing this more than the sand emperor, the largest of the gigarach family.
Beyond its tremendous size, the sand emperor is remarkably similar to smaller, earthly scorpions, preferring to burrow underground and emerging at night to hunt. They have a preference for the meat of other arthropods, which their venom is specially designed to bring down.
Their complex respiratory systems allow them to safely process both air and water, and larger specimens have been known to gravitate towards bodies of water, where the burden of their tremendous weight may be eased.
Though not officially domesticated, wild sand emperors do live in symbiosis with rural communities, locals occasionally feeding them in order to keep them around, the scorpions in turn deterring other large predators. Though similar in thought process to their smaller kin, the scorpions enormous brains do allow for more complexity, which in turn allows for the formation of emotional bonds. Though not truly social, a sand emperor may still come to enjoy the company of its neighbors.
Guangi - The largest theropod on Fronterra, the guangi is a highly derived ceratosaurid, adapted for hunting the various heavily armored megafauna it shares territory with. Its muscular body and powerful jaws are built to crack open even the toughest of bodies, and what it cant get its jaws around, it will simply break open with its dense, bony head crest.
The guangi prefers somewhat elevated terrain, sticking to mountains and valleys, and only rarely venturing down into the plains. Their thick, muscular bodies allow them to leap great distances and survive considerable impact, allowing them to hunt the deadly-yet-meaty squamhogs and dreadnousaurs that dwell in the same lands.
Though hardly the most common threat faced by travelers, the guangi's flashiness and charisma make it one of the most notorious in the minds of the people. This, coupled with the fact that their amazingly durable bones are prized inc rafting, means that they enjoy a heavy presence in pop culture and folklore.
Squamhog - Combining the worst aspects of warthogs, hippos, ceratopsids and dolphins, this protomammal is one of the most feared beasts on Fronterra. Though it does not hunt, it eats what it kills, and it fights for the sheer thrill of it. Squamhogs are viciously aggressive, owing to their highly intelligent brains and desire for emotional stimulation, coupled with their tremendous strength and weaponry. Seeking out fights is simply their favorite game.
Squamhogs will eat just about anything, from cacti to carrion. They enjoy chewing, as their mighty jaws require constant stimulation, and many will carry their favorite bones, rocks or even pieces of destroyed vehicles in their throat-pouches to chew on at their leisure.
Tundron - A bizarre descendant of protomammals, the tundron is unlike anything currently known to the fossil record. Ecologically, it is similar to an enormous elephant, preferring to wander the plains and graze from treetops, and occupying small but close-knit family groups. Though highly intelligent and able to use tools, the tundron prefers to keep to its own, avoiding contact with civilization. Their primary natural enemies include guangis, lindorms and swarms of scissormites.
Galvaderm - Representing the ossaderms, a group of arthropods who have developed vertebrate-like shapes and roles, I believe the galvaderm or its ancestors hail from some alternate Earth many millions of years ahead of my own.
The galvaderm is so named for the biological metal that comprises its shell, which it generates with a mineral-heavy diet. Young galvaderms are subterranean, foraging voraciously for roots, tubers and fellow burrowing animals to build up their bodies, in addition to the various metallic ore they consume and assimilate. Only when they reach full size do they come to the surface, where their lifestyle dramatically changes.
Adult galvaderms are photosynthetic, burying their underbellies and heads in the sand and leaving their large dorsal plates exposed, soaking up as much sun as possible in their sleep, then rising at night to explore and snack.
Galvaderms are curious creatures, and can travel great distances at night, only to return to their burrows by day and continue to absorb solar energy.
Galvaderm shells are prized as materials for solar panels, and many domestic breeds exist with different shell compositions based on what metals they were fed as larvae.
Dreadnousaur - Though the exact evolutionary lineage of this dinosaur is unknown, popular theory places it somewhere amidst the hadrosaurs, albeit highly derived. This behemoth fears nothing, wandering the deserts, the mountains and the jungles alike to sample a wide range of vegetables. When they tire of one group, they will move on to another. They have a special fondness for tangweed, and are one of the few creatures that can safely digest it - safely in this context meaning two days of rampant intoxication, rather than the expected muscular paralysis and suffocation.
Most societies treat them like elephants, giving them a wide berth and letting them go about their business. The dreadnousaur, in turn, tends not to bother those who dont bother it, save for the occasional bout of tearing into food stocks when the wrong craving hits it.
Nobo - Science is still not entirely sure of this creatures evolutionary origin. It enjoys fruits, fungi and carrion, and has been known to dig up cemeteries in search of rotten meat to consume. Its vivid blue fur is the result of algae living on the creatures skin, with which it lives in symbiosis.
The nobo endures a sinister reputation as an omen of death and a taker of children, and indeed there are accounts of them making off with livestock. They are never seen hunting, however, suggesting that there may be more behind the abductions than food. Indeed, exploration of their underground lairs reveals several seemingly abducted animals alive and well. It seems the creatures, like humans, enjoy having pets.
Mokembe- A defictionalization of the amphibious sauropod motif, the mokembe draws its name from the popular African cryptid. Though slow to anger, once its buttons have been pushed it can become a devastating fighter. A blow from its clubbed tail is louder than thunder and can carve a swath through trees, rocks and flesh alike. Every four years the creatures will go into heat, with females taking on a vibrant blood red coloration and developing a temper to match. Under the right conditions, they may be considered more dangerous than predators.
Mokembes are very rarely hunted, unless it can be guaranteed that all of the meat will be eaten. Their habitats are spread somewhat thin, making it difficult to keep tabs on the population at any given time.
Tectortoise - Found mainly in areas with volcanic activity, the tectortoise is equal parts animal and elemental. Its thick, rocky shell and metallic scales absorb thermal energy, boiling water in its gut and nurturing a bacterial cocktail that provides it with energy and nutrition. This allows the tectortoise to go years at a time without food. This in turn allows it to be a picky eater, subsisting otherwise almost entirely on fruit, despite its enormous size. As the tortoise is a juggernaut among juggernauts, it is fairly docile, fully aware that very little can harm it.
Palm snare - This upside-down insect combines the hunting strategies of mantids and herons. While motionless, the creature's limbs are virtually indistinguishable from palm trees, with its external gills giving off the impression of leaves. When a creature enters its sights, however, the palm snare will strike with its abdominal tendrils, grabbing the morsel and cramming it into its jaws, where multiple pairs of mandibles make short work of it, pulping the victim into a thick slurry which can be comfortably pumped upwards into its stomach without disturbing it externally. Like the sand spectre, its digestive system is inverted, for ease of consumption.
There is an urban legend that the palm snare is just the larval stage of something else, though science has no answer as to what, if anything, that may be.
Bronton - Bar none, THE largest creature on Fronterra currently known, the bronton is thankfully an extremely mellow herbivore.
Its exact origins arent entirely clear. The bronton is clearly not an earthborn organism, though that hasnt stopped it from integrating into the food chain, subsisting comfortably on ferns, fruit and cacti.
Their bodies are supported by heavy, rigid, semi-metallic bones, suggesting some relation to ossaderms. Their vertebral segments extend out through the flesh, forming the dorsal plates that protect their backs. Similarly metal-coated spikes line their tails, granting them offense beyond their sheer size, though few ever both to use them. Their bodies contain multiple apparently redundant organs, splitting the worload to supports them.
Bronton reproduce sexually, using their facial tendrils to exchange fluids. The female will then regurgitate a pod and bury it in the ground. This pod will grow for approximately six weeks, poking out of the ground at the apex of its growth. Both parents will guard this pod vigilantly, until it finally splits and four to six larvae will spill out. These larvae will develop limbs over the next few hours, and will begin to follow the parents around, forming small herds until they reach sexual maturity and break off to seek out their own mates.
When not guarding their young, bronton are remarkably relaxed, fearing few creatures. Only the largest death worms, or immense packs of guangi can hope to threaten them.
Bronton are curious creatures, and will often wander close to settlements, though seldom actually enter them. Caravans will often follow them on their routes, trusting the beasts immense shadow to keep predators at bay.

https://www.deviantart.com/phoenix-fightmaster/art/Fronterra-Creature-Guide-Giant-Monsters-878876116