I've thought about it for awhile, random fleeting thoughts that appear in my head that I think about in my spare time.
The Cultists overview:
Not sure what to call them, but they resemble most closely, a group of cultists that worship demonic and black magics. Their melee consist of demons with tough hides that can plow into enemy forces while being backed up my followers that will back it up with powerful dark spells and necromancy. Some cultists may even sacrifice themselves, forming a demonic pact in the middle of battle to summon various plagues, monsters and even explosive spells.
Cultists will be difficult, they must constantly manage expensive sacrifices. You can sacrifice population or units. Sacrificed population and units will provide Dark Energy, which is used, along with food, to produce demons, liches and the like. It is also used to generate structures. Livestock consists of slaves, demonic beasts and bought livestock. Bought livestock such as animals if not eaten soon enough, will turn into crazed demonic animals due to dark energy and blight. They can be unleashed on enemies or eaten with a large negative to the amount of food available. Cultists can mine resources and cut trees, although their natural surroundings are affected by blight, reducing the amount of resources readily available.
Buildings for cultists consist of Ziggurats and dark burrows, with a large necropolis in the middle. There is also a sacrificial altar where units may be brought for sacrifice. The fortifications of Cultists are a bit different.
Obelisks can be placed as walls and connected to eachother, they generate a force field that enemies cannot move through, although the cultists themselves can move through it. They can be moved and switched around at the expense of dark energy to fit the defense, even in the middle of battle. They have garrisons inside for casters and spellflingers to support troops. Enemies must destroy an obelisk to create a hole in protective shielding that they can march through. Once inside, the blight is stronger and enemies health regeneration stops or they suffer a small amount of damage to health and morale. The necropolis serves as a secondary defense. It can fire beams of dark energy at units in range that consume resources but do amazing amounts of damage. It is wise to siege the necropolis first. Obelisks can be upgraded to have an additional level, allowing more troops garrisoned and increasing the amount of distance it can support a force field.
The simplest of demons, the leech, is a small rodent-like pest that, when in great numbers, can hinder enemies by latching onto their heels and burrowing into their skin. The leeches die if the units are still alive by 15 seconds, but live to leech again if the enemy is killed.
The most basic of cultist units, the acolyte can hurl spells of of black or demonic magic. Black magic uses dark energy, while demonic uses dark energy aswell as some health. Acolytes may sacrifice themselves in the middle of battle to activate a number of effects. They include plague, sending hundreds of locusts that attack enemies, Leeches, summoning a few leeches and demonic explosion, causing a great explosion of dark energy that deals hefty damage to both enemy and allied units.
The lich has ascended a physical body, bound only by the armor levitating in the air surrounding a ghostly apparition. Liches can cast devistating spells and are the apex of the cultist race.
(Will edit in more units)
Hope it was a good read.