Mysterious Portal

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"Portal" redirects here. For the portal gun dropped by the Moon Lord, see Portal Gun.

I don't see why we can't just blow up those portals.

Emote Town Demolitionist.gif The Demolitionist

The Mysterious Portal instantly opens at the start of the Old One's Army event. Two Mysterious Portals will spawn at a minimum of 61 tiles and a maximum of 120 tiles away from the Eternia Crystal Stand on both sides, and they cannot be destroyed conventionally by the player. They are responsible for spawning all the enemies during the event, and will only despawn upon the event's completion or failure.


  • A good way to keep the enemies at bay near the Mysterious Portal is by firing the Clinger Staff or Rainbow Gun's projectile or by placing an Explosive Trap near the portal's entrance. This way the enemies will instantly take damage when they come out.