Everything to do with Vessels - how to obtain them, and complete them.
Thrall & Boss Spawn Chances
You can find Thralls and the Vessel Boss by mining Regular and Deepslate Ores in the world. (note - only naturally mined ores will count, manually placed ores do not).
Thralls
By default Thralls have either a 1.6% chance to spawn from Regular Ores, and a 2.4% chance from Deepslate Ores.
When a Thrall or Boss spawns, a 2 minute cooldown will start, and no Thralls or Bosses can spawn during this period. You can check your cooldown with /mine thrallcd (/mine tcd)
Vessel Boss
The Vessel Boss has a 5% chance to spawn per completed requiem on your pickaxe.
If you have all 3 requiems completed, then the chance is further increased to a total chance of 22.5% to spawn (without any modifiers).
If your previous requiem order was incorrect, or the first requiem slot is empty, the Vessel Boss will not spawn, but Thralls will continue to spawn.
