Practically all games point to Pogrebell, how essential he is, yet I would recommend him only as a secondary hero, because there is a bigger army and a more extensive gilde of magic. 

The best hero for the cart, where you can use more than one hero is Tarius. 

In general, this is an analog of Pogrebell, but not a mage, but a war. Why is this important? On the same start behind the necromants you can use more than one cheap army pool of skeleton-luchniks, and with their help you can resurrect in battles of survival tires, while they are necessary to activate the traps of the army, so that the bites die without loss. At the early stage - attack and defend gorazo luchnikes help with magic. 

The second - Tarius has a unique necromancy, because he increases the quantity of resurrecting units with the first strike. 

He and every vision on the third tire - Startovaya Army at Tarius is higher than that of Pogrebell. The remaining heroes I in principle are not distributed, so how in the game the main thing is to collect a giant army through resurrection or diplomacy. 

Therefore, to successfully use diplomacy, you need two heroes. One as a single target, and the second behind in the castle, so that through transformation they can destroy the army in the units of Necropolis. That's why, for the cart where you can use more than one hero, the best choice is Carx Carey. 

At the hero, how and all heroes fractions on the start have necromancy, but also "Diplomacy" and the key navik Harizma -is unbelievably stronger than the rest, and the same distinctive navig - can be safely combined with the field of battle without loss of army. 

For this reason, the Cary Carey skill can summon a single target in full strength with the first strike. And the second hero will be quick to destroy this army in the backline of Necropolis. And moreover, this gives a strong burst of development, because for the first dead you get 50-60 skeleton luchniks, at a minimum cost of 35. 

But not only that, tactics also. You need to build on the start only two support units for the army - transformers of the dead and the second level of skeletons. And further all constructions on the dengi (Diplomacy of the undead). 

Cary Carey also resolves one problem of the castle. On positive stages, heroes often don't have enough energy on resurrection of units, and then there is an option - many proceed, which saves energy.