Terraria Mods Wiki
Treasure Bag.gif Expert Mode-Only Content: This information (or parts of it) applies only to Expert mode and Expert mode worlds.
  • Geminga item sprite
TypePet Summon
TooltipA highly condensed star
Grants BuffCalamity's Vanities/Astrum Demus (buff)Astrum Demus
Buff tooltipWormheck
RarityRarity level: 9
Dropped by
Entity Quantity Rate
Astrum Aureus 1 30%
Summons Pet

Astrum Demus

Astrum Demus (Calamity's Vanities).png

Geminga is an Expert Mode-exclusive pet summoning item obtained from the Treasure Bag dropped by Astrum Deus. It summons a swarm of 11 small Astrum Deus worms, with one being slightly larger to follow the player.


  • Geminga is one of the smallest known stars.
  • The item was previously known as "Astral Star", but was changed for being too generic.
  • The item's summoning of 10 small worms and 1 large one is a reference to how the Astrum Deus fight previously worked.
  • The buff's tooltip mentions "Wormheck", a reference to the long deleted #worm-hell channel in the Official Calamity Discord