Pillar of Rust and Fire

High in a stony alpine valley stands the massive Pillar of Rust and Fire, a windowless pillar of jagged, rusting metal. No paths lead to or from this monument, but those tracing the Emerald River to its subterranean headwaters occasionally catch a glimpse of the tower outlined against the sky. At night, the top of the silent tower erupts in periodic bursts of flame, and close to dawn spindly, insect-like forms can sometimes be seen moving ponderously around its base. 
It’s at these times that the streams feed the Emerald run black and red, with fish floating belly-up or bearing strange mutations. Scholars who have studied the tower from afar believe it to be somehow related to the ruined gnome enclave of Jzadirune below Cauldron, but something has obviously gone horribly wrong.

Type

Tower