Suggested by GrandMaster
Nagash, Incarnate of The Wind of Death (Warhammer Fantasy) vs Mannimarco (first time here), The King of Worms (The Elder Scrolls) vs The Lich King (World of Warcraft) vs Shinnok (Mortal Kombat) vs Lord Vile (Skullduggery Pleasant) vs Sauron (Lord of The Rings) vs Typhus The Traveller (Warhammer 40k)
Battle takes place in Mordor, with the corpse of everyone who ever died there above ground.
Nagash has The Wind of Death, Mannimarco has unlimited black soul gems, Sauron has The One Ring, everyone has their usual gear.
Note from Rookie: No necromancer from Forgotten Realms? Odd.