During All Saint’s Wake, Tiergan got transmogrified into a puffy white bat. Being the kind of person who is incredibly adverse to magic, he immediately flapped and flailed around in a blind, frantic panic, nearly getting trampled and squished by people who were now several hundred times his size until he crashed smack dab into D’lyhhia.
Once he recovered, Tiergan begged her for help in transforming him back, swearing up and down that despite his present state, he was actually a rather powerful miqo’te fighter and could serve as a bodyguard for her if needed. D’lyhhia agreed to assist - even if Dodo was a huge turd about it, and eventually Tiergan was returned back to his original form.
Tiergan instantly swore her to secrecy so that no one would ever know of his secret Hallow’s End Shame: Being the cutest, floofiest bat there ever was.