The Astral Arcanum is a craftable post-Moon Lord Expert Mode-exclusive accessory. It causes astral stars to fall when the player takes damage, as well as providing immunity to the Astral Infection debuff. When the player is struck by a projectile, they will reflect it, which doesn't damage the player. This effect can only occur every 90 seconds.
It also boosts life regeneration by 3, even while the player is under the effects of a damaging debuff. When worn while being damaged by a debuff, the player's defense will increase by 20 and life regen will increase by an additional 3 (for a total of 6).
Pressing the Astral Arcanum UI Toggle key opens up a small menu, allowing the player to select a destination to teleport to by hovering their cursor above them and clicking. The player can teleport to either the Jungle, Underworld, Dungeon or to a random location. The teleports have no cooldown. This doesn't work if a boss is alive
|Arcanum of the Void||1|
- The teleporting effect of the Astral Arcanum is disabled if the world is on Multiplayer.
- The boost life regen while under the effects of a damaging debuff stat is powerful enough to bypass the disabled life regen stat given from Vulnerability Hex.
- Due to the Jungle's imprecisely defined location, teleporting to the Jungle can place the player nearby it instead of within it. It also tends to place the player underground.
- If the player is under the effect of one of the alcohols sold by the Drunk Princess, the accessory's life regen bonuses will be reduced to 2 regardless of other debuffs.