Mobgrade

Mobgrade gives hostile and neutral mobs a random upgrade every minute
There are 30 upgrades
Some unlock new abilities, while others keep leveling up
Stronger upgrades are rarer

The first upgrade always lets monsters spawn during the day and survive sunlight

Upgrades:

Daywalkers: Monsters spawn during the day and no longer burn in sunlight
Strength: More attack damage
Movement Speed: Faster movement
Vitality: More health
Armor: Adds 6 armor points
Attack Speed: Zombies and skeletons attack faster
Accuracy: Skeletons shoot more accurately
Awareness: Mobs notice players from farther away
Projectile Speed: Faster projectiles
Resistance: Less damage taken
Regeneration: Restores health every two seconds
Critical Hits: A chance to deal double damage
Fireproof: Immunity to fire and lava
Bleeding: Attacks can cause damage over time
Reinforcements: More mobs spawn near players
Combat Instincts: Zombies and skeletons manage distance and time their attacks
Door Openers: Ground-based monsters can open wooden doors
Lifesteal: Attacks restore the mob’s health
Volley: A chance to fire two extra arrows
Stun: A 25% chance to stun the player for one second
Hostile Neutrals: Untamed neutral mobs attack players on sight
Nether Invasion: Nether mobs spawn in the Overworld
Homing: Projectiles turn toward visible targets
Cursed Strikes: Attacks can apply a random negative effect
Projectile Immunity: Blocks damage from arrows, fireballs and other projectiles
Execution: A 5% chance to deal fatal damage, but a totem can still save you
Armor Break: A 5% chance to destroy one worn armor piece
Thorns: Reflects part of incoming melee damage
Burning Strikes: Attacks can set players on fire
Last Chance: A chance to survive a fatal hit with totem-like recovery, once per mob

Passive animals, villagers, tamed pets, the Ender Dragon and the Wither are excluded

Requires Minecraft 1.21.1 and NeoForge 21.1.256 or newer for 1.21.1