Operating System:
Windows 11

ISP:
AT&T

Type of Internet Connection:
Fiber

Internet Connection Speed:
1000mb/s

Date & Time:
6/27/2023, ~8:30 CST

Frequency:
Always, two occurences.

Character Name:
Enkidu

Race:
Elvaan

World:
Bahamut

Main Job:
Thief

Support Job:
Ninja

Area and Coordinates:
Throne Room, Macrocosmic orb fight.

Party or Solo:
Solo with trusts: Valaineral, Yoran-Oran, Ulmia, Koru-Moru, AATT

NPC Name:
None

Monster Name:
Duke Dantalian

Steps:
Duke Dantalian was fought after all of the other demon's were killed. When Astral Flow was used, several trusts died and the game immediately froze and crashed to the desktop. Upon logging back in I was transported out of the arena unable to continue the fight.

I've found that another user posted this issue 3 (!) years ago here: https://forum.square-enix.com/ffxi/threads/57307-Kindred-Spirits-II-crash-repeatable?