I'm here to propose the darkness faction.Lets begin! ~~~~~ Wraith

Darkness

Sphere projectiles, emitting a dark aura.

Reasonably weak, but can occasionally teleport away (within a limited radius, of course!).

Cost is dependent on the exact figures of damage, and teleportation. I'd recommend 450-600.

Consume with the darkness, or be consumed by the darkness

~~~~~ Demon

Darkness

Pitch fork

Slightly more powerful than a footman.

The cost, again, varies on the particular stats. 60-90 is my recommendation.

Hell isn't so bad! ~~~~~ Demon head butter

Darkness

It will propel itself forward with a magnificent pair of demon wings, and headbutt the enemy.

Incredibly weak, dies on contact with enemy.

I prefer leaving the costs to landfall, but I'd say 200-250.

Woohee! Yabadalargh wulalikik! ~~~~~ Dark shaman

Darkness

A shadow staff, that can temporarily change the team of units in the small radius it hits. Fires at about the same rate as a cannon, perhaps slightly slower. Works on friendly and enemy units.

The health would be similar to that of a thief, and movement would be slow. The dark shaman will stand still and fire once in range.

Once again, up to landfall. I'd say 550-700 would be reasonable cost.

Join us, you will become a god among men! ~~~~~ Dark Slime

Darkness

Rolls towards its target, gaining speed. Does more damage the faster it gets. Is temporarily immobilized after a successful charge. Does small amounts of damage by pressing up against its target if enough speed can't be built up for a charge.

I'm not entirely sure about the health on this one... Maybe 600?

I'm not so sure on the cost, either. It could easily change based on the AI of the actual unit. Lets go with 600 hundred again.

Intense squelching ~~~~~

Well, there you go. An entire faction. Up vote if you like the ideas, and want landfall to see them!