The ruined city of Dokeran, sometimes written Dokaren, stands on the Defaka River in the Mwangi Expanse. The city was destroyed several centuries ago by Tyruwat the Lost One using the artifact known as the Song of Extinction.
Tyruwat now lives beneath the city's grand temple, his life greatly extended by the years stolen from his cult and the local tribes using the Song. He is guarded by packs of howlers and a tribe of wild elves he has subjugated.1
For additional as-yet unincorporated sources about this subject, see the Meta page.