In addition to those previousy mentioned, there's also sorcery, including the dimension-ripping sanity-mangling chymeric portals, Visionary's lighthouse, gates through to Faerie or the Mythlands, random space/time ripples at the Nexus of Unreality in the Wookiegetlucky Swamps, and strange narrative anomalies in the zone where the narrative bomb went off and wiped out Arachknight City.