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I played against a Necromancer on the Underground map. The player skillfully prolonged the game, but it didn't save him. Difficulty: Veteran.
Final Iran, level 20, 16-8-25-22.
202 Assassins, 197 Furies, 73 Lizards, 66 Hydras (upgraded). 20+15+4 Matrons (not upgraded).
Zoltan, 14-12-26-15.
Approximately 1500 Skeletons, 267 Zombies, 250 Ghosts, 73 Vampires, 15 Liches, 15 Messengers, 6 Bone Dragons.
My losses: all Lizards, 2 Assassins, 4 Matrons, 62 Furies.
He cast Blind on the Furies and also applied Weakness and Slow debuffs on me, all as mass spells.
I attacked with melee units once using Chain Lightning, and the rest of the time with Implosion. Implosion destroyed 462 Skeletons (boots +50% damage to Earth).
He was summoning 120 Skeletons at a time. There was no summoning spell.
In general, as always, the dungeon was easy and I passed it without any problems.
P.S. The game lasted about 4 hours. The guy skillfully left me the castles, and he himself rushed to collect Skeletons.
In my opinion, the outcome was decided by the fact that I had upgraded my magic to level 5, where I got Implosion. In his native castles, the main castle had level 2, and the second castle had level 1, meaning there were no melee spells, and it seems he didn't get Plague either