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For the fictional weapons....

Anyone ever see the Hellsing OVA or Anime? The appearance of these after a Halloween themed event would make me consider changing skills...
(blatant Wikipedia copies)
This is the second Pistol made for the Vampire Alucard in the series...

Hellsing ARMS 13 mm Auto Anti-Freak Combat Pistol 'Jackal' - With a length of 39 cm (Almost 1' 4"), weight of 16 kg (35.2 lbs), and made of black gunmetal, it is not a weapon a human could even hope to wield, but as Walter noted, "It was never meant for a man." It fires special 13 mm armor-piercing, explosive, Mercury-core baptized bullets, with casings of Macedonian silver, powered by "Marvell's Chemical Cartridge N.N.A.9." It has six rounds per magazine. It was designed almost exclusively as a weapon against Iscariot's Alexander Anderson, who shrugged off the Casull rounds with ease.

Or for the rifle folks...

Victoria's preferred (or at least most-popularly associated with her) weapon is the Hellsing ARMS Anti-Midian Cannon 'Harkonnen'. Weighing 120 lb. (~60 kg) unloaded, this 30 mm, single-shot, break action, breech loader cannon uses various types of shells, including depleted uranium with silver for piercing armored targets and incendiary napalm rounds for destroying large groups of opponents both on land and in the air.