Tested with all enhancements disabled. The final boss of the game only has 2 attacks, one halves your health, the other one, whatever it is, causes the game to softlock. If he does this attack the game will become unresponsive. Music will continue playing but you won't be able to move or interact with the game except for the pause button. That still works for some reason.
Duckstation 0.1 - 5437 - g06d6447e (master)
http://redump.org/disc/178/
Tested with all enhancements disabled. The final boss of the game only has 2 attacks, one halves your health, the other one, whatever it is, causes the game to softlock. If he does this attack the game will become unresponsive. Music will continue playing but you won't be able to move or interact with the game except for the pause button. That still works for some reason.
Xenogears (USA) (Disc 2)_1.zip
While the game is softlocked the log repeats this over and over.
Computer specs