1) Start a new game
2) Once you can control Rhys save the game (F5 in Genecyst) and quit
Open the save game in your favorite hex editor. Set the values at E144 and
E15A to FF. This will let Rhys use the aero parts and Laya's Pendant even
though they're not in his inventory.
Alright usual stuff here. Go upstairs to marry Maia. Escape the dungeon
and so on.
When you leave Landen head east to the airstrip. Wren will transform
even though he's not in your party. Fly down to the southwest and enter
the palace.
Laya's Pendant will work. Head on through to Elysium.
Hop over to the nearest airstrip.
Fly over to the rebel cave.
You'll have the dialog with Ryan and Lune. Mieu will join the party. Go
grab the sub parts when that's all done.
Travel back to Aridia and enter the whirlpool.
Go meet Laya, who looks like Lyle, but Wren actually joins the group.
Zany.
Run down to the southwest palace and travel to Frigidia.
Go to the nearest airstrip.
Talk to the dudes in Skyhaven and head down to the dungeon.
Get the aero parts and trek back to Landen.
Go get Orakio's Sword, unleashing evil and such.
After getting the sword Miun will be waiting in the desert. Go talk to
her and..
So close! Apparently there are more events that need to be set for this
to work. When they're found I will post the results here.. I think it
should be possible to have Rhys fight Dark Force if the right events are
found.
