Historical clue formulations

• Vampire vanquisher, e.g. — 2022-10-03
• Buffy, to vampires — 2020-09-15
• Heavy-metal band with a killer sound? — 2016-12-21
• Buffy, to vampires — 2016-02-08
• Assassin — 2011-11-10
• Offer? — 2010-02-19
• Buffy is one — 2001-07-11
• Beowulf, notably — 2000-12-17
• Beowulf, to Grendel — 1999-07-08
• St. George, for one — 1994-10-16
• Assassin — 1994-05-14