Install into a Win 7 (32bit) bottle.
Install DXVK.
64bit bottle causes game to crash when the launcher tries to start game.
Without DXVK games crashes on login.
Have tested starting zone, and various adventure zones without issues. Getting between 40 to 70 FPS.
Entering a busy city causes FPS to crash. The FPS displayed never drops below 10, but there are these large artifacts on screen and the game has these huge pauses. Turning on "Optimise for siege warfare" only helps a little bit.
A WineHQ entry states that the 64bit version of the OS is required to play siege mode, so I'll attempt to get that working.
https://appdb.winehq.org/objectManager.php?sClass=version&iId=39025
Update
Noticed that the WineHQ entry is for the 5.9 staging version of Wine!
Update
Looks like a minimum of Wine 5.5 is required to get Aion to launch in a 64 bit prefix, but as soon as all the players try to load in a busy city the game just freezes. With it running in CXOffice 19 in a 32 bit bottle it would struggle through, but not freeze. Still pretty unplayable until you get out of the city, but face hugging a wall helps.
Unable to test Wine 5.9 since I'm PPA shy, but I'm looking forward to the day I can play it properly as it was on my gave up due to migrating to Linux list!