;_;
Also, I had a little time and I reordered the "riotous assembly". Maybe someone will figure something, or maybe I'm walking into a dead end again xD
aaaa
Cccc
dddd
eeee eeee eeee eeee
ffff
gggg
hhHh
llll
nnnn
oooo
rrrr
ssss ssss
tttt
uuuu uuuu
vvvv
Edit: the only destructive "rubicund" event I can think of is when Kuja goes berserk and destroys the genomes and the place they live in, bu I think that one's ruled out since you can't talk to any of them before going there, and unless I'm mistaken, you stated somewhere that the character we're looking for can be seen through all the game. That and I think someone suggested a genome as the answer, which you said was wrong.
Mmhh... There's also the Cleyra settlement's destruction (forgot the name of the Eidolon, though) and Lindblum (Atomos I think).