Skeletons
SFENCE

Add player and some animals skeleton to your game.

Mob Mese Monster Classic
TenPlus1

Adds classic Mese Monster.

Zombies4Test ( Reload )
PixelZone

Adding zombies, structures and weapons to your world..

Stalker
adikalon

Adds a scary and strong monster that lives in caves

Forgotten Monsters (Reworked)
PixelZone

Add monsters and bosses to your world...

Mobs Ethereal Bosses
PixelZone

Adds Bosses in biomes from the "Ethereal NG" and "Mineclonia" mods

PaleoTest for Hades Revisited
SFENCE

Adds Not Only Prehistoric Fauna and Flora to Hades Revisited.