This data pack serves as an addon to any mod featuring conspicuously resilient foes that don't quite qualify as true bosses and thus lack boss bars of their own, and does basically what the title of the data pack says, by granting them their very own boss bars that track their health (like any other boss should)! This also includes vanilla's Elder Guardian and Warden. Additionally, true bosses that for whatever reason also lack a boss bar of their own have also been granted one to finally bequeath them that more appropriate and clear facade to their boss status that they so deserve.

It is also worth noting that the boss bars added by this data pack do not necessarily work the same way as regular boss bars do, as they won't actually appear right off the bat as when any of the included mini-bosses spawn. Rather, the mini-bosses have to receive at least a single strike of damage from a player in order for the bars to show up. Should the player stray off into the distance at a minimum of 60 blocks from a mini-boss, their health bar will then vanish and require another blow of damage in order for them to reappear once more. These measures serve to prevent the redundancy of boss bars on a player's screen from enemies they aren't anywhere near inclined to provoking, thus rendering the bars obsolete by default.

For mob battles or other testing purposes, you may also run commands to toggle the boss bars on by demand. You can do this by:

Running the command /trigger mbbbforceshowbossbars

You can disable boss bars from showing up for certain bosses through data packs and giving them the tag #minibossbossbars:boss_exception. For bosses that exist through data packs (like Ultris or Vanilla Mob Minibosses), instead run the command /tag @e[whatever goes in here] add minibossbossbars.boss_exception through a ticking function in a data pack. As to find out whatever goes between those square brackets, feel free to pry open the mod with WinRAR, navigate to data > miniboss_boss_bars > functions and scour through whichever function has their designated mod names to look for the desired boss.

However, if you are unable to do any of the above on your own, you may instead use the configuration data pack for the mod with its own set of instructions on how to utilize it: https://www.curseforge.com/minecraft/data-packs/mini-boss-boss-bars-configuration-datapack

The data pack doesn't mandate the installation of every listed mod within each version simultaneously; rather, it adjusts to accommodate the ones that are currently installed.

The lists shown below detail what mods and their respective bosses are supported by this data pack.

1.21.1

Alex's Caves (Unofficial Port)
• Tremorsaurus
• Forsaken
• Gum Worm
• Hullbreaker
• Tremorzilla (onIy avaiIabIe and triggered with the /mbbbforceshowbossbars command)

Alex's Mobs (Unofficial Port)
• Warped Mosco

Apotheosis
• All Apothic Bosses (with boss bar colors that vary by tier)

Arthropod Phobia Expansions
• Termite Tunneler Queen
• Spider Snatcher
• Spider Prowler
• Spider Reaper
• Solifuge Skulker
• Centipede Evictor
• Crab Constrictor
• Spider Moth
• Scorpioid Bloodluster
• Draconic Voidlasher
• Arthropleura Abomination
• Wasp Nemesis
• Spider Infestor
• Spider Matriarch
• Arachnoid Trisector
• Diabolos Decimator

Battle Towers
• Battle Tower Guardian

Born in Chaos
• Spiders Mother
• Glutton Fish
• Dire Hound Leader
• Nightmare Stalker
• Krampus
• Missionary
• Lifestealer
• Supreme Bonescaller
• Sir Pumpkinhead

BossCraft Respawn: Unofficial Port
• Fire Lord
• Rogue Master
• Spider Queen
• Pharaoh
• Grim Reaper
• Megablock

BossCraft Respawn: Overlord
• King Scorpion
• Ice Devil
• Overlord

Brazil Legends
• Capelobo
• Mapinguari
• Mapinguary

Choup's Drakvyrn Mod
• All Drakvyrn variants (if wild/untamed, boss bar disappears and will no longer appear again once tamed)
• Drozen (if wild/untamed, boss bar disappears and will no longer appear again once tamed)
• Drakthal (if wild/untamed, boss bar disappears and will no longer appear again once tamed)

Classic Battle Towers
• Battle Tower Golem

Crimson Steve's Mutant Mobs
• Stunt SkeIeton

Desert Tombs
• Pharaoh Mummy

Discerning The Eldritch
• Blood Matriarch

Dungeons and Taverns
• Spider Queen
• Freeze
• Ancient Guardian
• End Castle's Haunting

Dungeons Content
• Corrupted Cauldron
• Ancient Guardian
• Redstone Golem
• Redstone Monstrosity
• Mushroom Monstrosity
• Obsidian Monstrosity
• Redstone Pigman Monstrosity
• Tempest Golem
• Arch-Illager

Effigy
• Gargoyle

Fishing Expansion
• Elder Drowned

Friends & Foes
• Wildfire

Frostiful
• Frostologer

Fungal Infection: Spore
• Proto Hivemind
• Sieger
• Howitzer
• GazenBreacher
• Hindenburg
• Hohlfresser
• Grakensenker
• Stahlmorder
• Leviathan

Galosphere
• Berserker

Greek Fantasy
• Arachne
• Circe
• Cretan Minotaur
• Medusa

Ice and Fire: Dragons (Community Edition)
• Fire Dragon (if wild/untamed, disappears when asleep)
• Ice Dragon (if wild/untamed, disappears when asleep)
• Lightning Dragon (if wild/untamed, disappears when asleep)
• Cyclops
• Gorgon
• Hydra

Iron's Spells 'n Spellbooks
• Archevoker

Klsts' Monsters
• Monstrous Spawner (this includes its advanced variant)

L_Ender's Cataclysm
• Amethyst Crab
• Coral Golem
• Coralssus
• The Prowler
• Ignited Revenant
• Ignited Berserker
• Wadjet
• Kobolediator
• Aptrgangr
• Clawdian
• Ender Golem

Lands of Icaria
• Captain Revenant
• Arachne

LUMINOUS: OVERWORLD
• Tree Ent
• Hermit King
• Mummy
• Sea Viper
• Yeti
• Vile Gator
• Phoenix
• Bone Stalker
• Witch Doctor
• Cherry Tree Ent
• GoldenHermit King
• Red Mummy
• CoralSea Viper
• Arid Yeti
• Frozen Vile Gator
• Wind Phoenix
• Bogged Bone Stalker
• Woodland Witch Doctor

LUMINOUS: BEASTS
• Tree Ent
• Hermit King
• Mummy
• Sea Viper
• Yeti
• Vile Gator
• Phoenix
• Bone Stalker
• Horseless Headsman
• Witch Doctor
• Crimson Spitter
• PigIin Executioner
• The Furnace
• Cherry Tree Ent
• Golden Hermit King
• Red Mummy
• Coral Sea Viper
• Arid Yeti
• Frozen Vile Gator
• Windy Phoenix
• Bogged Bone Stalker
• The Scarecrow
• Woodland Witch Doctor
• Warped Spitter
• Basalt Executioner
• The Soul Furnace

LUMINOUS: NETHER
• PigIin Executioner
• Mushlin King
• The Furnace
• Basalt Executioner
• Warped King
• The Soul Furnace

Moar Bosses
• All elemental bosses

Mobstein
• Witherstein (phase 1)

MobZ
• Boss Zombie
• Boss Skeleton
• King Charles
• Big Boss
• Pillager Boss

Monstrosteve
• Monstrosteve

Mutant Monsters
• Mutant Zombie
• Mutant Skeleton
• Mutant Creeper
• Mutant Endeman

Myths & Legends
• Possessed Armor Inquisitor

Occultism
• Possessed Warden
• Possessed Elder Guardian
• Unbound Afrit
• The Wild Hunt (in the style of an event, boss bar scales with the total amount of health of all skeletons initially present in the event)
• Wild Trial (in the style of an event, boss bar scales with the total amount of health of all skeletons initially present in the event)
• Wild Raid (in the style of an event, boss bar scales with the total amount of health of all skeletons initially present in the event)

Polar's Exploration Additions
• Endermite Queen

Random Bosses
• Random Bosses

Razor Tyrant: The Reign of Terror
• Razor Tyrant

Royal Variations
• Royal Enderman

Saint's Dragons
• Raevyx (if wild/untamed, boss bar disappears and will no longer appear again once tamed)
• Ignivorus (if wild/untamed, boss bar disappears and will no longer appear again once tamed)

Tensura: Reincarnated
• Orc Lord

The Ceilands
• Castle Lord

THE UNDEAD REVAMPED
• Clogger
• The Heavy
• The Pregnant
• The Royal
• The Horrors
• The Dungeon

The Undergarden
• Forgotten Guardian

TofuCraftReIoad
• Tofu GandIem

TOWERS OF CHAOS
• Nether Obelisk

Trails of Forsaken Lands
• Chilled Collector
• Reaver & Illagockey
• Mimiorin
• Dracant
• Vespa Milite (& Golem Guardian)
• Scorpion Guardian
• Abanoul

Useless Reptile
• Lightning Chaser (if wild/untamed, boss bar disappears and will no longer appear again once tamed)

Vampirism - Become a vampire!
• Vampire Baron

Wizard Tower
• Wizard

YUNG's Better Desert Temples
• Pharaoh

Zombie Nightmare Expansions
• Brutaliser

Mini-boss Boss Bars {Data Pack}