Regarding Lena's account of the previous generation Master of Purification sacrificing himself to become the King of Bone Biting, calling for a sunship attack, it's not just idle boasting by the members of the Circle Tower.
In fact, this event is also recorded in the history of the Blood Vulture Clan.
Even though Triss had long been "dead" by then, Salockdale, a faction leader who participated in the fourth Black Disaster, according to Murphy's description found in Salockdale's diary in the Crimson Corridor, indicates that on the fateful day that decided the defeat of the King of Bone Biting, indeed a great being sacrificed himself to pave the way for victory.
It can be basically concluded that the "great being" he referred to was Master Mireding.
Moreover, for a Vampire Duke to write such praise for a human feat in his diary shows what a glorious figure Mireding was in the era a hundred years ago.
