Halcyon Seed

The  is a boss item introduced in the Scorched Acres Update, dropped by defeating at Gilded Coast.

Upon beginning a Teleporter Event, the player will lose their Halcyon Seed and Aurelionite with 100% (+50% per stack) damage and 100% (+100% per stack) health will appear and fight alongside the player. The player will retrieve their Halcyon Seed when Aurelionite dies, either when the Teleporter Event is finished or killed by other means, whichever occurs first. In multiplayer, players who die after Aurelionite is summoned will still recover their Halcyon Seeds when Aurelionite dies.

This item stacks based on the total amount held by all players combined (items held by  do not count), similarly to the.

If the player is fighting the and is in phase 4, Aurelionite will spawn and help the player.

Version History

 * Anniversary Update
 * Gameplay Changes
 * Changed summoned pre-stack scaling from current-difficulty-based hp + damage bonuses to leveling up to the ambient level like other summoned characters
 * Summoned Aurelionite attention span: 5s ⇒ 15s Developer Notes: Aurelionite’s raised attention span should make it less likely to get distracted by weaker monsters attacking it so it’s more likely to spend its time fighting stronger monsters.


 * Early Access Content Update 5
 * Major Content
 * Added New Item Lore Entry:


 * Early Access 'Skills 2.0' Content Update
 * Gameplay Changes
 * 🌧︎ Friendly now has special AI to be more aggressive


 * Early Access Scorched Acres Content Update
 * Major Content and Changes
 * Added New Boss Item: