Uber Mobs are a new type of mob added in the 3.1 update. Each planet has its own Uber mob that is summoned by finding and activating their altar. They are double the size of a normal mob and spawn with minions to help them out. When they are destroyed, they drop their non-essential loot and their "soul". Destroying this soul will drop one of their set items.
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Uber Mob Altars are found very rarely underground on all planets. There is a glitch that can cause the names of some of the Uber Mobs to be swapped around, so none of the names are definite. They sometimes drop cards, used to create Pocket Uber Mobs. (But we won't tell you how to make them anywhere).
Fat Pig Card
Horus resembles the ancient Egyptian god [Anubis], associated with mummification. Horus can be found on Seth. Horus appears to be an Egyptian deity with the head of a canine and the body of a man. He holds a cane along with his staff. Oddly enough, Horus has three ear piercings. However, there is research showing that this was uncommon in Ancient Egypt.
Deadly Skeleton Card
The Germstriker resembles [Frankenstein's Monster] from Mary Shelly's Classic Horror. It wears a purple tattered shirt, blue pants, and brown boots. The Germstriker has red eyes and the the Frankenstein Monster's signature bolts in its neck.
Golden Knight Card
The Webclaw is a giant Blue Spider that can be found on Alba. This seems out of the ordinary, however, since Blue Spiders are found on Xeno. It is also inaccurate to call the Webclaw a spider, since it only has four eyes and five legs. Webclaw cannot climb, so building a room with platforms will suffice as an arena. The Webclaw does not use its weapon, so it relies on its minions and spitting web-like projectiles.
Red Brother Card
Squirch appears to be a larger version of a purple Gnawler. Like other enemies on Thetis it has gills and fins along with a fish mouth. This does not however explain its pants. He wields a Double-sided Trident associated with the Greek God [Poseidon]. This makes sense since Poseidon is the God of the sea in Classical Mythology.
Griever is a beefy orc-like creature resembling the Armored Belly Tribals and is adorned with the typical gold and ivory ornaments of Yuca, which were thought to originate in Central America. It wears a skull necklace, ivory pauldrons on each shoulder, and a Gold Band on both of its arms. Griever has Green Eyes, a prominent Gold nose ring, and Tusks.
Yuki Ruins Card
Kratios sticks to the Sci-Fi theme of Xeno with its purple skin, huge Green eyes, and its many head tentacles. Kratios has silver claws and a green gem between its eyes. Kratios shares many of its traits with the Purple Murks of Xeno.
Acid Xenons Card
Presumably found on Xeno
Kroptor resembles a mosquito with its large orange eyes, large red antennae, and pincer-like mouth, much like the Purple Anthers of Mykon It shares the Blue Diamond Emblem on its chest with its sword. Kroptor wears heavy purple armor along with a red cape, speculated to be wings. Mykon's association between mushrooms and insects may be due to the hive-like nature of both organisms.
Armor drops all have the following stats: 1.2 health, 10 luck, 0.2 regen, 16,7,8,7 defense, 12,7,6,6 attack, 0,10,0,0 movement, and 16 acid resistance.
Sword has the following stats 3.2 damage, 3 range, 1380 durability, 0.30 life leech.
Green Brother Card
Coldshadow shares many traits with the Cold Shadow Lurkers of Cryo except being bigger and having longer silver claws. Coldshadow is massive and is the biggest Uber Mob in the game. It has large blue eyes, a gaping mouth, and is covered in large silver spikes. Coldshadow also appears to have 6 claws on each hand. The diamond on its sword appears to be similar to the one on the sword of Mykon's Uber Mob.
Cold Souls Card
Infernus is a taller Soul Ripper with four red eyes, shriveled dark red skin, prominent shoulder epaulets, and sharp claws on its hands and feet. Infernus has a gaping mouth with few teeth, much like the Uber Mobs from Cryo and Umbra. Infernus shares some similarities with the Soul Rippers of Magmar. Infernus uses a large staff with a red orb at the point. It appears to be fixed around a bone of some kind.
Gutstriker shares some similarities with the Skexotons of Lilith, appearing to almost be an upgrade of some sort. Gutstriker is an Ancient Skeleton powered with bright red cords from an unknown power source. Its battery powers its glowing red eyes and its dual arm cannons. After its health is fully depleted, it will transform into its second form. In its second form, its cords have been severed and it crawls on the floor instead. Gutstriker shares many traits with [Skeletron Prime] from [Terraria].
Ghost of the Lili Card
Rusttalon appears to be an ancient zombie with a purple head, green eyes, large orange horns, and full orange body armor with purple epaulets. He walks at you and shoots his pew-pews like every other Uber. It is from tor and is very powerful. It shares many similarities to the Demon Wailer Blights of Tor.
Armor drops all have the following stats: 2 health, 10 luck, 2.00 thorns, 8,12,12,8 defense, 7,7,12,7 attack, 7,0,0,0 movement, 10 fall resistance, and 5 lava resistance.
Eviscerating Reaper Card