Allow me to sperg...
"The entire reason they were so admittedly bloodthirsty near the end of "Ill Met in Lankhmar" is because the women they loved had been burned alive by the Thieves' Guild."
Vlana and Ivrian were hung by sorceress magic and then eaten alive by giant rats. When they were found by the heroes, Mouser turned over some coals to burn the sight out of his mind. He lit up his hoard of purloined goods in the process.