''There must always be a Lich King''

“There must always be a Lich King.”

“Does there? Let’s think about this for a second.”

Tirion crowns Bolvar.

“Well, crap! I guess there does now.”

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The Lich King is a metaphysical entity - the one who carries its mantle is just a throttle. Without a figurehead the essence of undeath would be free to bleed endlessly from the Frozen Throne. Bolvar acts as a spigot controlling the flow of foul energies from whatever realm the Nathrezim tethered ours to (presumably the source realm of undeath.)