Voodoo Demons spawn in Terraria’s Underworld, but they can be uncommon and their appearance is not guaranteed within a set time. In vanilla Desktop version 1.4.5.8, the cited spawn-selection rolls amount to a conditional 1-in-70 chance; that is not the overall spawn probability. If you are playing with Calamity Mod, also check for its Voodoo Demon Voodoo Doll, which blocks nearby spawns.
Check your location first
Voodoo Demons are associated with the Underworld. If you are searching elsewhere, move to the Underworld and allow time for enemies to spawn. The Terraria Wiki’s Voodoo Demon entry identifies it as an Underworld enemy.
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Why the wait can be long
The spawn-selection detail cited by the Terraria Wiki for Desktop version 1.4.5.8 describes a 1-in-7 roll to select a Demon variant, followed by a 1-in-10 roll to replace that Demon with a Voodoo Demon. Multiplying those conditional rolls gives 1 in 70, but it is not a reliable overall spawn rate: earlier spawn-selection branches can preempt them, so the actual frequency is lower and variable. A long wait alone does not show that the game is broken.
This figure is specific to the cited Desktop 1.4.5.8 code reference. It should not be assumed to apply unchanged to other platforms or Terraria versions. The wiki page was indexed but could not be opened for direct verification here, so the calculation is attributed to its displayed code note, not to independent testing.
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If you are playing with Calamity Mod
Calamity documents a craftable Voodoo Demon Voodoo Doll that blocks nearby Voodoo Demon spawns. Check whether that item’s spawn-blocking effect is active near your search area. This is a mod-specific mechanic, not a vanilla Terraria blocker. See the Calamity Mod Wiki entry for the Voodoo Demon Voodoo Doll.
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What to check if one still does not appear
- Confirm you are in the Underworld.
- Give the variable spawn selection time; there is no guaranteed interval established by the cited information.
- If Calamity is installed, check for the nearby Voodoo Demon Voodoo Doll effect.
- If those checks do not explain it, note your platform, Terraria version, world seed, mod list, and any active spawn-control items. Those details are needed to investigate a specific world; the available information does not establish a universal set of blockers across versions and mods.
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