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Two elements were present in the beta version for upgraded units, but only one in the release. The chains have been simplified – now, each attack by a unit or spell with an opposing element deals 5% * level of the racial skill as additional damage if the Elemental Vision ability has been taken and the Altar of Chaos has been built. Upgrading this building, the Altar of Primordial Chaos, gives an additional 10% bonus; the effect of the building in other Dungeon cities is cumulative.
I would like to discuss the city development plan because, look, the Necropolis players are already giving advice; it's not right for the Shadow League to lag behind. I usually attack only peasants or skeletons on the first day, gathering troops with two heroes. The hero I plan to level up always takes one or two chests for experience first (they are practically unguarded on any map), while the other gathers resources. If the forest and ore are guarded by archers, the first move is with the Guild of Mages (the Eldrit archer destroys them in droves); if not, the order is as follows:
1. Town Hall
2. Guild of Mages
3. Beasts
4. Upgrade to Furies
5. Scouts
6. Upgrade to Assassins
7. Dark Raiders
8. Upgrade to Grim Raiders, buy them, and move on.
By this time, it is desirable to take the Tactics ability; then, Furies and Grim Raiders easily defeat Hunters, Marksmen, and even Succubi.
9. City Hall
Next, we build a cheap Market, Forge, and Pit of Sacrifice to gain points for the Capitol. It is usually built on the 12th-13th day, and the Hall of Shadows on the 14th.
15. The main hero should return to the city; we build a level 2 Guild of Mages, buy 4 Witches + 4 Raiders + 5-6 Furies and 7-8 Assassins. Now, Grim Raiders with a +9 attack buff and Ice Arrows are enough to defeat Mages, Druids, Liches, and all melee units up to level 6, except Paladins. The hero begins an intensified leveling process and can reach level 13-14 by the end of the 3rd week. In the city, we build Hydras, Minotaurs, a Stronghold, a Castle, and a Resource Tower – in my opinion, it's not worth rushing for Dragons; you'll end up with nothing, and 1-2 Dragons don't make a difference in a 5-player game.
Pit of Sacrifice.
I never sacrifice native units, only joined units or cheap, low-level undead if there is a city of that type. 1 Fury is given for 32 Skeleton Archers, 40 Imps, 20 Zombies. For a Minotaur, you need about twice as many. Each subsequent increase in the growth rate requires twice the sacrifice.