Discussion about Dungeon (Dark Elves).

Dungeon has a building that becomes available after the Magic Guild reaches level 4; it's called either the Chain or the Elemental Portal, whatever. The point is that it allows the Warlock to see what element each unit is composed of. This helps to plan successful attacks. For example, if a Hydra is Water and a Minotaur is Fire, then attacking the Minotaur with the Hydra will increase the damage. The same applies to spells.

That's how it works:)

You only need to build a Magic Guild of level 1, after which you can build the Altar of Chaos for 3000 + 3 sulfur, mercury, crystals, and gems. This building, combined with the Elemental Vision ability, activates chains that provide 5% * racial skill level as additional damage when attacking with a unit or spell of the opposite element. The Altar of Primordial Chaos gives an additional 10% bonus and costs 5000 + 10 ore.

P.S. I wouldn't recommend focusing on these buildings before you have Capitals, Witches, and Dragons. It's best to do it when your army is already substantial, the damage from spells is also high, and the racial skill is upgraded to Expert.