Question: What is the name of the Undead Nation in the Warhammer Fantasy universe which is home of the Tomb King? 

Context articles: Warhammer Fantasy Battle
Chaos (Warhammer)
Warhammer 40,000
Nehekhara
Undead (Warhammer)
Khemri
Von Carstein
The Southlands
Warhammer: Invasion
Warhammer Fantasy (setting)

Warhammer: The Game of Fantasy Battles (formerly Warhammer Fantasy Battle and often abbreviated to Warhammer, WFB, and WHFB) is a tabletop wargame created by Games Workshop, and is the origin of the "Warhammer Fantasy" setting.
 The game is designed for regiments of miniatures of various fantasy races such as humans (The Empire, Bretonnia, Kislev), Elves (Dark Elves, High Elves, Wood Elves), Dwarfs, Undead, and Orcs and Goblins, as well as some more unusual types such as Lizardmen, Skaven and the daemonic forces of Chaos, with each race having its own unique strengths and weaknesses.
In Games Workshop's "Warhammer Fantasy" and "Warhammer 40,000" fictional universes, Chaos refers to the malevolent entities which live in a different timespace, known as the Warp in "Warhammer 40,000" and as the Realm of Chaos in "Warhammer Fantasy".
 The term can refer to these warp entities and their influence, the servants and worshippers of these entities, or even the parallel universe in which these entities are supposed to reside.
 The most powerful of these warp entities are those known as the Chaos Gods, also sometimes referred to as the Dark Gods, Ruinous Powers, or the Powers of Chaos.
 Similarities exist between the Warhammer idea of Chaos and the concept of Chaos from Michael Moorcock's Elric saga, which also influenced D&D's alignment system.
 Further similarities can be seen with the godlike extradimensional Great Old Ones of horror writer H. P. Lovecraft's stories.
Warhammer 40,000 (informally known as Warhammer 40K, WH40K or simply 40K) is a tabletop miniature wargame produced by Games Workshop, set in a dystopian science fantasy universe.
 "Warhammer 40,000" was created by Rick Priestley in 1987 as the futuristic companion to "Warhammer Fantasy Battle", sharing many game mechanics.
 Expansions for "Warhammer 40,000" are released periodically which give rules for urban, planetary siege and large-scale combat.
 The game is in its eighth edition, which was released on June 17, 2017.
Nehekhara is a fictional land in the Warhammer Fantasy world.
 It is the home of the Undead forces of the Tomb Kings and the origin of the Vampire Counts, two conflicting factions of undead.
 It is the Warhammer equivalent of Egypt; it even has the Valley of the Kings and the Great Pyramid.
 Although most of Nehekhara is a parched desert completely devoid of life, several trade routes pass through the deserts and a few oases are to be found scattered sparsely throughout the sands.
 The only living kingdom is that of Numas, which still maintains a thriving human population which serves the tomb kings as loyal subjects, and are in return protected by an army that never sleeps.
The Undead of the Warhammer Fantasy Tabletop Wargame (Games Workshop ltd.), were introduced to the game in its very earliest editions.
 The term itself can refer either to the undivided and all-inclusive army—ranging from ghosts and vampires to skeletons and mummies—or to the separate components which make up the two: The Tomb Kings of Khemri, and the Vampire Counts.
 Up to and including the fifth edition of Warhammer Fantasy Battle, the Undead represented the combined forces.
 For the sixth edition, Games Workshop divided the Undead into two separate armies to represent the chaos which Nagash created when he cast his Spell of Awakening to begin his assault on the lands of the living.
An undead nation in the fictional world of the Warhammer Fantasy setting, Khemri is home to the Tomb Kings, an army composed of skeletons and various decayed creatures.
 The theme of the army is based on the culture of Ancient Egypt, with an emphasis on its more morbid tendencies such as mummification.
 Correspondingly, the hordes of skeletons are led by withered liche-priests who used a proto-necromancy/death magic (less potent and sinister than true necromancy practised in the modern Warhammer world) and resurrected kings and princes.
 Khemri was originally called Nehekhara, of which Khemri was a major city.
The Von Carsteins are a vampiric bloodline in the fictive setting of "Warhammer Fantasy", including the Warhammer Fantasy Battle tabletop wargame.
 Their stories are told through background material in publications such as "Warhammer Armies: Undead" and "Vampire Counts" and in a trilogy of novels by Steven Savile; all three of which are published, "Inheritance", "Dominion" and "Retribution".
The Southlands are a mythical location in the Warhammer Fantasy universe, closely corresponding to real world Central Africa.
 The Southlands lie south of the Land of the Dead and are dominated by dense swamplands and rain forest.
 The southlands are inhabited by lizardmen, savage orcs and forest goblins, and small tribes of what adventurers call the "Dark Men", who are content to live at peace with nature and seem to have the protection of the Lizardmen.
Warhammer: Invasion is a Living Card Game (LCG) (variant of collectible card game) designed by Eric M. Lang and produced by Fantasy Flight Games in 2009, set in the Warhammer Fantasy universe.
 Like Fantasy Flight's other LCGs, "Invasion" is sold as a core set, which can be played on its own, or built upon with expansion packs.
 Each pack has a fixed set of 3 copies each of 20 cards.
 There are six factions in "Invasion": Dwarves, Empire, Orcs, Chaos, High Elves, and Dark Elves.
 The first four have decks in the core set, while the elves' decks are available in the "Assault on Ulthuan" expansion.
Warhammer Fantasy is a high fantasy fictional universe created by Games Workshop and used in many of its games, including the table top wargame "Warhammer Fantasy Battle", the "Warhammer Fantasy Roleplay" (WFRP) pen-and-paper role-playing game, and the MMORPG "".