Fractured Portals

Fractured Portals generate in temple structures (Desert, Jungle, Swamp, Ice). The frame will contain one special Reinforced Deepslate block that, when brushed, activates the portal. This is a one time activation per-player. The block remembers every player who uses it.

Entering the portal breaks it behind you and sends you to the Alterworld dimension in the same area temporarily. You will be given an effect called Planar Fracture that lasts up to a few minutes. When the effect clears, you are sent back to the empty portal in the Overworld.

This gives you a few precious minutes to collect materials only obtainable in the Alterworld to bring them back to the Overworld. This feature is primarily for passive players who do not wish to play progressively, yet still want access to things restricted to the Alterworld.