Savegame??!? You start a new game and warp to E3M8 with no weapons or ammo or artifacts carried over from previous maps and savegames!
p.s This classification should change once the Korax' Heritage RPG is released because there will be some bosses that'll match the fun of D'Sparil (like a Heresiarch that can teleport around like D'Sparil or Korax and do some other fun stuff too).