Strange visual effect in Dagoth Ur's chamber
There is a strange, animated magical effect within the chamber you first confront Dagoth Ur, just before the door to the Heart chamber. It's present as soon as you enter the room for the first time and remains even after Dagoth Ur is destroyed. I don't believe this behavior is present in vanilla.
Played on Windows 7 with GTX670.
(RM-3390 from redmine: created on 2016-05-14 by August Avatar, , closed on 2016-05-14 by scrawl .)