Noun
kinslayer (plural kinslayers)
(rare, mostly in fantasy fiction) One who slays his or her own kin; a parricide.
Athain Kinslayer is a captain in the Calpurnian navy, a star voyager who has given up on personal happiness in pursuit of his duty. Source: Internet
Lews Therin himself kills his friends and family, and is known afterwards as "Kinslayer." Source: Internet
Ten years ago, the Kinslayer returned from the darkness. Source: Internet