This mod is a spiritual successor to Gravestone Mod – Extended.
It brings back all of the original creatures and expands upon them with new, unique mobs designed to enrich and challenge the gameplay experience.

The main goal of the mod is to make exploration more engaging and dangerous, especially during the early stages of the game. New enemies, behaviors, and encounters turn the world into a more hostile and unpredictable place, encouraging players to adapt, prepare, and survive rather than rush through progression.

At the moment, the mod includes next creatures:

Slimes(all of them applies hunger, and drop "gel". Furthermore medium and big slimes can contains some biome specific items, such as seeds, flowers, saplings, mobs loot or ores):

Verdant slime
Sandy slime - Spawns in desert biomes. Applies slowness.
Frozen slime - Spawns in cold biomes. Applies freezing. Place snow on blocks. The big one splits powder snow on death.
Mud slime - Spawns in swamp. Applies nausea. Replace dirt blocks by mud.
Jungle slime - Spawns in jungles. Applies poison. Place moss on blocks.
Cave slime - Spawns underground. Applies weakness.
Abyssal slime - Spawns deep underground. Applies darkness.
Toxic Sludge - Spawns deep underground. Melts some blocks(convert them to damaged variants). Applies rust.
Molten slime - Spawn in nether and near destroyed portals(in the overworld). Ignites you on attack. The big one splits lava on death.

Bats(All of them applies bleeding effect on attack):

Cave Bat - hostile bat which spawns everywhere in the Overwold in the dark below 30 level. It applies nauseaeffect on attack.
Vampire Bat - undead bat which spawns everywhere in the Overwold in the dark.
Ice Bat - hostile bat which spawns in cold biomes in the dark. It freez enemies.
Flying Fox - gian flying bat which spawns in the jungles in the dark.
Blazing Bat - hostile bat which spawns in the Nether. It sets enemies on fire when attacking.
Withered Bat - hostile bat which spawns in the Nether. It applies wither effect on attack.
Volatile Bat - hostile bat which spawns in the Nether. It explodes instead of attack.
Chorus Bat - hostile bat which spawns in the End. It teleport enemies on attack(like chorus fruit).

Skull Crawlers - undead spider like mobs. Rarery spawns at death of other mobs:

Skeleton Skull Crawler
Stray Skull Crawler
Bogged Skull Crawler
Parched Skull Crawler
Wither Skull Crawler
Zombie Skull Crawler
Husk Skull Crawler
Drowned Skull Crawler
Zombified Piglin Skull Crawler

Breezes:

Thunderstorm - spawns in the rain or thunder
Blizzard - spawns in the rain or thunder. Applies freeze and slowness
Sand Devil - spawns in the rain or thunder. Applies darkness and weakness
Dirge Gale - spawns in soulsand valleys. Applies blindness, rust and unluck

Ghosts:

Hollow Stalker - a semi-neutral ghost-like mob. It flies, can pass through blocks and ignore player till it comes to close. Its main feature - extinguish torches(only torches).
Lost Soul - a hostile flying ghost-like skeleton skull. Spawns in the nether.

Creepers:

Desert creeper - spawns in deserts and badlands biomes
Snowy creeper - spawns in snowy biomes
Cave creeper - spawns in caves
Deepslate creeper - spawn in caves at deepslate level

Undead wolves:

Barghest - huge ghost like wolf. It applies blindness effect on attack.
Skeleton dog
Zombie dog

Undead Cats:

Skeleton cat
Zombie cat

Undead horses:

Skeleton Horse
Zombie horse

Water mobs:

Minnow - small and weak hostile fish.
Piranha - hostile fish. It applies bleeding effect on attack.
Pike - big hostile fish.

Jellyfishes(all of them applies hunger):

White Jellyfish - huge jellyfish. Applies slowness. Spawns in any oceans.
Blue Jellyfish - applies freezing. Spawns in cold oceans.
Green Jellyfish - applies poison. Spawns in mangrove swamps and in warm oceans.
Yellow Jellyfish - applies nausea. Spawns in swamps and in any oceans.
Pink Jellyfish - applies weakness. Spawns in swamps and in any oceans.
Purple Jellyfish - applies blindness. Spawns in deep oceans.

Water mobs:

Drowned Sailor - ocean unded monster. It applies "Call of the Abbys" effect on attack.
Phantom Diver - ocean unded monster. It applies "Call of the Abbys" effect on attack.

Other mobs:

Mimic
Swamp Thing - semi-neutral(till you out of water) monster. Spawns in swamps in the water(even at daytime). It applies slowness effect on attack.
Giant Frog - hostile giant frog.
Mummy - desert unded monster. It applies weakness effect on attack.
Possessed Armor - undead ghostlike armor, fully covered with armor.
Skeleton with sword - replaces 20% of vanilla skeletons. Can block arrows.
Snoman - vanilla like hostile snowman. It applies freezing effect on attack.
Frozen Giant - a huge frozen giant. Spawns in cold mountains.
Hill Giant- a huge giant. Spawns in hills and mountains.

Items:

Bat wing - used to craft leather, as a food and as a fuel
Gel - used to craft torch, as fuel and as a food
Crown of the Slime King - used to start "Slime Rain" event

Mobs effects:

Bleeding - prevent healing
Call of the Abbys - you drowning even on surface
Rust - damage your armor and items in hands(but can't destroy them)

Curse Enchantment:

Curse of Starvation - item owner are starving and receiving 0.5 damage per item with 20% chance

Additionally this mod adds natural spawn of the next vanilla mobs:

"Cave spiders" - spawns underground in darkness
"Killer rabbits" - spawns rarely on the surface in the darkness
"Illusioner" - spawns rarely in the darkness

Events:

Slime Rain – This event is triggered for the first time on the morning of the seventh day (if the weather is clear; otherwise, it will occur on the next clear day). After that, at least 7 days must pass before it can happen again. The base chance is 4% + 8% for each additional day after the seventh day, up to a maximum total chance of 90%.

When the event starts, you will receive the message: "Slimes start falling from the sky!" and see an event progress bar. The weather changes to rain, and various slimes from this mod (all except Molten Slime and Toxic Sludge) begin falling from the sky.

The event has 3 phases:

During the first phase, only tiny slimes fall.
During the second phase, medium slimes begin to fall.
During the final phase, large slimes start falling.

The event ends after 10 minutes.

Compatibility:

Infernal mobs - Some of mobs, added by my mod, should never be infernal(you can change it in cinfigs)
Gravestone mod - Extended - Phantom diver has a rare chance to drop its costume. Potion of "Bone Skin" gives you protection of "Rust" debuff

Recommended mods to use with:

Infernal mobs - makes some enemies much more harder.
Forged in Blocks - additional challenge in game progression at the early/mid game.
Sophisticated wolves - wolves can be trained to guard you base against slimes and other mobs

!!!Warning!!!

Additionally this mob restricts sleep by certain conditions. You can't sleep while hunger or under opened sky(it can be disabled in configs)

Vanilla hostile mobs cap increased to x2. In case of any performance problems(or any other reasons), it can be changed in configs to default vanilla value, or even increased.

Torches can't protect you against monsters in the caves anymore - Hollow Stalker extinguis them(only normal, copper and soul torches), so you should use another, more expensive sources of light to keep caves lighted.

My other mods:

Withered Lands