No, Necromancy doesn't work on map 200. I barely managed to place Ifrits in the Fortress; the Necropolis is blocked by 10+ Monks+, and on level 12, I defeat them without looking – there are 20 of them, 1 Ifrit, 20 Imps, 15 Gogs. Then, I attack 40 Vampires for the relic, add another Ifrit and a Behemoth, and there are 50+ Serpents+, I have nothing to fight with. I head to 2 resource points, going off-road, and I'm attacked (2 Ifrits, 11 Gogs, 6 Demons) and also encounter 1 guard at the Hive, 100 Gargoyles+, I almost defeated them all. Hoping that the opponent won't arrive before turn 131, I don't give up, but I miscalculated.
Thank you for your time.