How should I develop my units to defeat a Knight?

When I played as Laslo against a Dwarf, I realized that Axel isn't weak... (this is just... with the right build, Axel won't give your Necromancers a chance, believe me!). Ask Mish-gan how much it costs. With what will you defeat hundreds of Knights?...Dark magic won't save you; in a long game, you can find the entire Dwarf set, and then a whole bunch of Dark creatures will fall... and in a head-to-head fight, the Knight will take him down faster and with anti-magic... go back to the Necropolis.