Ruptured Black Metal

• Alby
  • Advanced Hardmode
    • 10% chance of the pool.
    • 2,000 / 10,000 chance in that pool.

  ---

• Barri
  • Advanced
    • 3% chance of the pool.
    • 1,000 / 10,000 chance in that pool.

  ---

• Ciar
  • Advanced Hardmode
    • 10% chance of the pool.
    • 2,000 / 10,000 chance in that pool.

  ---

• Coill
  • Intermediate
    • 7% chance of the pool.
    • 1,000 / 10,000 chance in that pool.

  ---

• Fiodh
  • Intermediate
    • 3% chance of the pool.
    • 1,000 / 10,000 chance in that pool.
    
    
  • Advanced
    • 7% chance of the pool.
    • 1,500 / 10,000 chance in that pool.

  ---

• Peaca
  • Basic
    • 7% chance of the pool.
    • 1,000 / 10,000 chance in that pool.
    
    
  • Intermediate
    • 7% chance of the pool.
    • 1,500 / 10,000 chance in that pool.

  ---

• Rabbie
  • Advanced
    • 3% chance of the pool.
    • 1,000 / 9,500 chance in that pool.

  ---

• Rundal
  • Basic
    • 7% chance of the pool.
    • 1,000 / 10,000 chance in that pool.
    
    
  • Advanced
    • 7% chance of the pool.
    • 2,000 / 10,000 chance in that pool.
    
    
  • Advanced Hardmode
    • 10% chance of the pool.
    • 2,500 / 10,000 chance in that pool.

---

Dead-end chests in some dungeons actually have a chance to drop a ruptured, but the chance of even getting to the point where it might decide to poke that pool is so small (125 / 100,000 for Rundal Advanced) that it's not worth all the math.