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Necromancer artifacts: staff of the underworld, cloak of deadly shadow, ring of broken spirit, helmet of chaos, dragon necklaces, shield, greaves; ring of speed, armor of the forgotten hero, skull of Marcel. Don't forget that I gave him "reflection" and "undead protection from magic," although it's practically impossible to guess that the elf will go into chaos.
Elf artifacts: ring of speed, unicorn bow, dragon shield and dragon greaves, lion set, skull of Marcel, ring of kinship with machines.
Necromancer build? Probably. But I tried. At least his summoning was good, although maybe darkness would have been better. But that's not a fact, since almost all of the necromancer's army was defeated by chaos.
Added 3 minutes later
If I had known that there would be another argument about necromancers, I wouldn't have chosen him as an opponent.