HadeanAnchors

Hadean Anchors adds deterministic Hadean anchor sites to suitable Nether caverns. Each anchor builds a small altar arena and summons either a Hadean Smasher or Hadean Blaster when players enter its activation area. Boss types alternate between anchors, active encounters are saved, and defeated anchors use a seven-day in-game cooldown before another fight can begin.

It also makes Hadean Breathe's Fury weapon functional as a firearm: right-clicking Fury consumes one Hadean Bullet and fires a fast, visible projectile that deals 14 damage on a direct hit. Fury has a short six-tick use cooldown, and players receive a clear message if they do not have ammunition. Creative-mode players do not consume bullets.

It requires Hadean Breathe for the boss entities, Fury, and Hadean Bullets; it does not duplicate that mod's content.