Steps or right-clicks teleport, behaviour depends on the current layer.
A glowing purple block (light level 10) that teleports the player the instant they step on it or right-click it.
By default it sends the player to Purgatory's layer 5, but if triggered while standing on layer 8, it sends them to layer 9 instead. This block is embedded in the various "next" structures (purgatorylayer4next, purgatorylayer8next, and others), its exact behaviour switching depending on which dimension it is placed in.
purgatory_next