A Warrior hero from the Dungeon faction? That's absurd...

Personally, I believe that focusing solely on warrior skills for a Warlock is not a good idea. Firstly, many stats are allocated to magic and knowledge. Secondly, the troops have weak defenses. Thirdly, there is no magical support for the troops, in the form of light or dark magic. Fourthly, the elemental chains used by the Warlock can be easily influenced by chaos spells, thereby increasing the damage inflicted by the troops. So, developing a Warlock without magic, relying only on troops, is at least suicidal. Not only will it be very difficult to deal with neutral creatures, but also in the final stages of the game.