Spoiler ahead!
.
.
.
.
.
.
.
.
.
.
I don't feel noticing anything that can called Final Hidden Thing when the character become a chicken and get defeated by the event Birdman. The character just fall in fear and never wake up again.
Thanks for playing!
I thought the thing was good enough because it at least involves a TF scene which lets a player walk around on the map and "fight" monsters in the TF'd form.
But I admit that it is actually rather disappointing.
I'm not planning to change the game data for this, but I might reorganize the spoiler txt files so they will not make players expect something too spectacular.