This ruin marks the easternmost point of the highlander castles. In Suns’ Ebb CY 584, the castle was decimated by an immensely powerful magical strike. A boiling black cloud settled in the sky above Greenkeep, and vast strokes of lightning and acid rain cascaded down on the building. The walls and towers were shattered and the keep ruined, with most of the garrison here slain and only a few managing to escape westward to safety. It is still unknown who mounted this formidable attack. The most often-rumored theory connects the attack with the necromancer Raspalan, garrisoned with the troops here. Raspalan was a minor princeling of the House of Garasteth, and was known to have fled his birthplace west of Rinloru and no few other eastern and southern cities during his lifetime. He left behind a trail of murder, outrage, and bitter enemies. The destruction of Greenkeep is generally believed to be due to one of those enemies catching up with him.
The ruin takes its name from a radiant green glow which still emanates from the keep on exceptionally cold nights. The few who have ventured anywhere near the place mumble about moving stones, the keep swelling and contracting before their eyes, and blood-freezing screams that seem to come from far beneath the ground. But this is probably just a hallucination. Nonetheless, survivors are rumored to speak with horror of Raspalan’s experiments in the keep dungeon and to tell tales of wretches and the strange supplies which were ferried down to those dungeons to enable the grisly wizard to continue his malign research.