vasik
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For Chaos players on level 3, there's a difficult choice to make – Nightmares are slow on the map and in battle, but otherwise, they are superior. Since the strategy often involves a quick advance across the map, Ifrits have to be built. Even in the early campaigns, when the hero is weak and can't function without an army, Medusas are still taken into battle; here, a Nightmare could be a better choice. And if there are many Chaos castles, building a single type of level 3 unit will strain resources, so Nightmares are often built to save sulfur for Dragons. If it were possible to have Goblin Knights in the castle, the choice would be clear; I would only build them, but it's not allowed.
As for the choice between Tigers and Elves, they are usually not meant to be carried around; however, Elves are better for defending the castle, as they are the only ranged unit available for purchase there. Carrying them around is not a good idea; they are slow and much weaker than Tigers, making them far less useful. And the level 4 unit for the Death faction also presents a similar dilemma – often, there isn't much choice due to resource constraints; Skeletons are usually better, unless you have a Tactician with high morale.
As for the choice between Tigers and Elves, they are usually not meant to be carried around; however, Elves are better for defending the castle, as they are the only ranged unit available for purchase there. Carrying them around is not a good idea; they are slow and much weaker than Tigers, making them far less useful. And the level 4 unit for the Death faction also presents a similar dilemma – often, there isn't much choice due to resource constraints; Skeletons are usually better, unless you have a Tactician with high morale.