Biome Bosses: Trial Sentinel

Biome Bosses

Hand-crafted boss fights for the newest vanilla places. Every boss lives in a real vanilla biome or structure and fights with that place's own mechanics, so it feels like part of Minecraft, not a random RPG add-on.

Boss #1: The Trial Sentinel

The Trial Chambers finally have a guardian. The Trial Sentinel is a 4-block-tall copper automaton built from copper plates over a tuff-brick frame, with a glowing trial-spawner core in its chest.

How to fight it

• Craft a Sentinel Core: a Trial Key in the middle, 4 Blocks of Copper and 4 Breeze Rods around it.
• Use it on the ground: the Sentinel kneels, powers up its core and stands up with a roar. It is invulnerable while it wakes up.
• Phase 1: heavy punches, a Ground Slam shockwave (jump over it to take half damage) and the Gale Volley, a burst of wind charges fired from its chest.
• Phase 2 (below 66% health): it roars, opens trial-spawner rifts that bring in zombies, skeletons, boggeds and husks, and starts using the Gale Leap to land on players who kite it or pillar up.
• Phase 3 (below 33% health): faster, harder hits and ominous reinforcements, including strays and breezes.

Oxidation: the signature mechanic

The longer the fight goes, the more the Sentinel oxidizes (Copper → Exposed → Weathered → Oxidized). Each stage makes it tougher (+15% damage reduction) and stronger (+15% damage), but slower.

Hit it with an axe to scrape the oxidation off. Each scrape removes one stage and staggers it: it drops to one knee, its core shutters slam shut, and it takes +50% damage for a few seconds.

Punch its wind charges back at it. A deflected gale deals double damage to the Sentinel and staggers it too.

Loot

• Gale Core (always): right-click for a gale burst jump that launches you up and forward and blows nearby mobs away. There is no fall damage from the jump, like a wind charge jump, and a 3-second cooldown.
• 12–24 Copper Ingots, 3–6 Breeze Rods
• 60% chance: Ominous Trial Key
• 20% chance: Heavy Core
• 35% chance: a rare trial chambers item (Flow or Guster banner pattern, Creator music disc, Bolt armor trim)
• 300 XP and 3 advancements (Who Turned That On?, Rust in Peace, Gale Rider)

Details

• Boss bar whose color follows the oxidation stage
• Fully animated: awakening, walking, punches, slam, volley with a pulsing core, summoning, leap and landing, staggered kneel and a collapse-and-explode death
• Emissive core, eyes and wind intakes that glow in the dark
• It stays near the place where it was summoned, repairs itself when nobody is fighting it and despawns its reinforcements when it dies
• Immune to poison, wither, slowness and weakness, and takes half damage from explosions, so no cheap tricks

Versions

Pick the file that matches your loader and Minecraft version. It is needed on both the client and the server.

Coming next

One boss per new vanilla place, released with the game drops:

• Frost Tyrant for the Ice Caves (26.4)
• Brimstone King for the Sulfur Caves
• Poplar Elder for the Dappled Forest