Vlad the Impaler
Vlad the Impaler, V, is a unique vampire notable in that he holds the Candelabrum of Invocation. He resides at the top of his tower in Gehennom. Like his weaker brethren he possesses the abilities of flight and magical breathing. He is always generated with a two-handed sword, a battle-axe, a bow and 3-14 arrows, or with a 21% chance, nothing.
Be careful not to confuse Vlad: if he levelports by a confused scroll of teleportation, you get to look for him in his Tower, all of Gehennom above it, and the entire Dungeons of Doom, which is very annoying. You better not use Magicbane on him.
Vlad is widely regarded as being an exceptionally weak enemy to be a mandatory fight at the stage of the game when he is faced; he is not significantly stronger than the vampire lords which appear as normal enemies.
Jokes abound of fighting him with food rations, thoroughly rusty thoroughly corroded tin openers, or not moving every second turn while fighting him, or a variety of other absurd scenarios which would normally result in YASDs, and still easily defeating Vlad. The items used for such exploits have become known as Vladsbanes (or Vladbanes or Vladsmashers, in a mockery of the Banes) and on the occasions when such an item is used it is often so #named in tribute. The danger of confused levelport by Vlad, gives you a legitimate reason to use a Vladbane-type weapon instead of Magicbane!
A variety of patches have been written to address this issue by altering Vlad in some way. One of the better known ones is the aptly-named Vlad Balance patch. The Dudley's dungeon strip for 30 November 2006 featured several humorous attempts to remake Vlad; see also the comments for the 30 November and 1 December strips.