Posts from Let’s come up with a monster. Auto-translated

Nature Elemental.
Nature elementals resemble huge bears made of earth and woven branches. They attack enemies at a distance, using sharp roots that grow from the ground. Nature elementals are immune to earth and water magic, and to spells that affect the mind.

Banshee.
The ghosts of women who died a painful death are known for their deadly voice. Banshees are incorporeal, and any unit attacking them has a 50% chance to miss. They are not very strong in melee combat, but their touch drains life from their victims, leaving them weakened. And their shriek is equivalent to the Unholy Word spell.

Mountain Giant.
Mountain giants are overgrown cave dwellers. Taller than colossi and titans, these giants are undoubtedly the most physically strong creatures in the world. However, they are not very intelligent, and their only special ability is to crush the walls of fortresses, throwing boulders as well as a catapult. Mountain giants fight with massive clubs and have a large number of hit points (250).

Grell.
These creatures resemble a levitating brain with a beak and ten tentacles. Grells are about the size of a human. They have no eyes and therefore cannot be blinded. Grells attack with their tentacles, trying to penetrate the victim and inject a paralyzing poison (25% chance that the victim will be paralyzed for a number of turns equal to the number of grells).

Demilich. The highest form that only the strongest and most ancient liches can achieve is the Demilich. It no longer has a body, as it no longer needs one. Only a skull remains of the Demilich, around which magical energies swirl. They know the most destructive spells: Earth Shock, Ring of Cold, Disintegration Ray, Raise Dead. Demiliches are immune to magic that affects the mind, to death magic, to cold, and to electricity. In melee combat, the Demilich unleashes its magical energy on the enemy, while simultaneously draining the souls of 5% of enemy creatures. Due to its small size, it is very difficult to hit the Demilich with ranged weapons, and it is always as if under the Dodge spell. The only weak point of Demiliches is the small number of hit points for such creatures (60).

And Mugais is like Magnus :D :D :D

Mugais (by the way, what's your name? Mugais doesn't sound quite right), these monsters really aren't suitable for heroes. Maybe they're too insignificant for them... Anyway, we'll see.

Nowizard;47296Coward:
Attack - 17-23/20-27.
Defense - 10/15.
Initiative - 15/20.
Features: marksman. Chance to escape from the battlefield - 15%. After upgrade, the chance increases to 20%

:

Read too much about the Secret City?:D ;)

I suggest a neutral monster. You'll have to think three times before attacking even one.

Judge - health 350
attack = 70-80
defense = 20
morale is completely absent. Even artifacts that increase morale do not affect him.
luck. The same story.
special. Judge: With any attack, the opponent loses at least one creature. Verdict: 25% chance that the Judge's attack will kill exactly half of the attacking creature, but there are also advantages here: if, for example, the Judge attacked 10 skeletons and the verdict worked, then 5 skeletons will die and no more. The Judge will guard only the most valuable artifacts or places of special importance. For example: a passage between rocks, behind which there is a lot of artifacts and chests of treasures. Note: Judges will always join the player who, according to overall statistics, is currently in last place.

By the way, what are boar-men and elephant-men called in fantasy? Something like rat-men are called Skaven (Warhammer) or Wasps (Secret City).

Added 1 minute ago
No monsters are stronger than city monsters, otherwise it's a failure! - I disagree, azure dragons are stronger than city monsters, but that doesn't ruin the game, the main thing is to make such neutral creatures difficult to access.

Lycanthropes are shapeshifters, but not exactly what I meant.
It's a matter of taste. But if a hero is strong and can capture dwellings of high-level creatures, they will provide a pleasant variety, and if he doesn't capture them, he will still remain strong. If he is weak, he won't be able to.

Mine too. I didn't like them in Heroes 3 either.