The bug concernces the ending of the Stendarr Tower haunting quest. The last dialog line the ghost has is conditioned to the death of the wrong person. The supplier is actually Haladroth ( TR_m3_Haladroth ). Also the quest doesn't account for situations when the player kills one of the suppliers, but lets the other live. Issue first discovered with 18.07 but confirmed in the internal TR_Mainland release.