Upcoming mobs

Strongholder - Floating gauntlet that grabs, pounds, and swats to attack. Floats eerily through stronghold tunnels, maybe passing through walls.

Phoben - Fear spirit that spawns in roofed forests. Wields fear magic, a lantern, and a long, darkness-infused blade called Ej. Fighting the phoben will involve carefully but quickly deciding when to strike and when to block.

The Sculptor - A simian guru that can be found meditating on mountaintops. He will challenge players to complete obstacle courses made of floating rocks. Those who pass this test are granted the ability to wield powerful earth magic.

Forest Dryad - Will grant players her magic pan flute in exchange for the Phoben's lantern as thanks for defending the forest.

Biloko - Rival tribe of the Barakoa. Jungle pack hunters that lurk in the canopy before leaping down on their prey. Their simian features, ornamented headdresses, long claws, and glowing red eyes strike fear into their prey (there is going to be a biloko chief) now you can see tribal wars happening (rarely)

Nimbus Drakes - Flying serpents with clouds billowing from its head and wings. The clouds turn grey before the drake unleashes its lightning attacks. It circles an egg in a nest on the top of its mountain, which can be claimed and hatched by the player who defeats the mother.

The Winter Order - A league of cryomancers residing in a frozen citadel.

amethyst stag beetle - amethsyt stag beetles found in amethyst geodes can fly with this wings and shells and fight for monsters with sharpy mandibles male and female too meet and feed slimy balls too meet female lays their eggs on amethyst block untill hatches the egg larvae do eats amethyst crystals is larvae stage pupa stages evolves the larvaes can evolves for pupa stage and adult stage can tame amethyst crystals.

emerald butterfly - emerald butterflies can smell flowers to attach them emerald butterfly comes its using this tongue to suck up flowers watch out for monsters such tribals a barakoas

desert scorpion - these's are predators called arachnids desert scorpions can prey insects including barakoas tribals found in deserts using to sting effect poisonus sting player getting stun at scorpion's sting scorpion killed drops scorpion armor

Considering:
Large, scary insects in swamps, maybe large, scary frog-things to go with them
Anglerfish-like deep sea monster
Ents that can be created from trees using an item.
Golems that can be created from Geomancy boulders.
Snake Charmer - Humanoid desert boss that spawns in a temple structure. He can summon snake spirits by playing his flute, and can transform into a moving painting on the wall to dodge attacks and move across the room.
Just a plain dragon. I'd like to try my hand at this timeless monster concept.

sawuropoid - a theriziosaurus is a dinosaur this sharpy long claws to attack other various mobs and monsters

diamond rhinoceros beetle - these diamond rhino beetles males and females to mate larvae hatched larvaes to eat diamonds and fruits woods adult diamond rhno beetles larvaes will grew into diamond rhinoceros beetle have genders male and female cycle again diamond rhino beetles to tame diamonds also attacking all predators such Grottol