Vaults and and powerful traps appear much more often and at shallower levels. Plenty new objects and artifacts are available as well as randomly created artifacts in addition to the normal ones. Vampire - is hurt by light and loses 1 hp per turn in the sunlight and while wielding one of the artifact lightsources, if he hasn't light resistance. The vampire should immediately enter the dungeon, a walk in the town at daytime is not recommended without sun protection factor 1.000.000. He resists cold, poison, dark, and nether, has hold life and emits permanent light.
Vampires can bite monsters to suck the blood of the victim.
This is the best way to feed them, because food has only minimal nutrition value for an undead being. Sprite - Resists light, has feather fall, and gets extra speed later. The sprite can throw magic dust to sleep monsters. Spectre - Resists cold, nether, and poison, has see invisible, slow digestion and hold life and gains telepathy later. Can wail to terrify monsters.