Halcyon Seed

The Halcyon Seed is a boss item in Risk of Rain 2, dropped by defeating at Gilded Coast.

Upon beginning a Teleporter Event, the player will lose their Halcyon Seed and Aurelionite will appear and fight alongside the player. When the Teleporter Event is finished, Aurelionite will die. The player will be given back their Halcyon Seed when Aurelionite dies, whether naturally or if killed by other means. 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. Aurelionite's damage is increased by 50%, and its health by 100%, for each Seed held by the party after the first.

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