a crucial part of my wol florian's backstory & impetus for becoming an adventurer in the first place has always been his elder brother roselin's death. roselin (a scholasticate dropout, back-alley healer and apothecary's assistant) was arrested by the temple knights and witchdropped without trial after his shady mentor had been found to be dealing in heretical goods; florian's rage at the injustice of the system that lead to these events & guilt over not having been there to protect roselin are fundamental core aspects of his character. it's one of those fixed events in the timeline that i can barely imagine who he'd be without.
that said: sometimes i still like imagining fix-it AU sillytimes where roselin Survived Somehow & took up the adventuring life himself as a freelance healer. also he's smooching alchemist guildmaster severian.