The essence of the tactics when playing as the Dark Elves.

in my opinion, you shouldn’t even consider that strategy… in a regular game, everything is completely different, and it’s also better to level up the skills for the Town’s army, because you won’t be able to handle everything with just Chaos on the later stages of the game (for Town, focusing on Chaos is basically the same as losing). In general, you’ll end up with a strong Chaos and a weak army, and if the opponent is leveling up Resistance and Reflection + artifacts, then using Chaos spells here is useless (even if you take the Fire Lord and blast with a fireball – I talked about its advantage in another topic – it won’t help, because the army will be too weak and won’t deal enough damage, even with 50% armor penetration).
I agree with Vayshаn that Town players are just waiting for you to focus on Chaos, and the element of surprise is always important :)
In general, I think that for Town, you need to level up at least Attack and Luck, otherwise the army will be useless.