D&d Forgotten Realms Cutter

Teirflin and Doum'weille are half-Drow siblings, locked in competition for the ownership of the bloodthirsty sword Khazid'hea - the Cutter! Their father, the Drow renegade Tos'un - a veteran of battles against the Kingdom of Many-Arrows - is forced to choose his heir... but what does the powerful sword have to say on the subject?