Backstory.
It was a warm night. It have been raining for twelve days already in the city of Dunwich. The rain pattered the roof of an old warehouse in city outskirts.
"This is my city, dirty scum! You leave now or pay with your blood!" - a tall man surrounded by his fighters shouted.
"There's no need to spill blood, Don Vinchenzo. We can share areas of influence and live in peace" - answered an aged woman with golden monocle.
"Don't make a fool of me. It was my business for twenty years, and now some newcommers try to "share" with me? This is my last warning, live this city or you will become a bullet-crammed bag of meat!"
Two group of men raised their weapons, pointing at each other.
Suddenly the light went off.
"What was that?"
A scream of a man.
"Aah, I see it!"
A scream of another man, full of terror.
The guns started to pop, covering the floor with cases and blood. The bloodfest began.
...
"Where am I?.. Am I dead?.. Is it hell?.. I am sure I saw a devil himself" - Don Vinchenzo stood up and looked around. It was a morning. A lush grassland was before him, and a dark forest in the distance. He looked around. There were other people rising from the ground, some of them wounded, some unhurt. There was a single feature which united them: a look of horror and incomprehension on their faces.
Concept.
Two teams of gangsters were dragged between worlds by a strange planar creature which lived near the Dunwich city. There was a breach in the compact of Erebus, some anomaly caused by abnormal events, and the people were dropped in this creation instead of being devoured. This concept makes an allowance that there're other creations, not only Erebus, but normally they cannot contact and the link between them is different from the link between "planes" in Erebus.
People who stayed alive are mostly gang warriors so they don't know a way how to make a smithy or to create a medicine, so they start to develop technologies anew.
The idea behind this that we have a "normal" society, however the divine and arcane branches are different from other races of erebus.
The way they were brought here is unnatural and it created a thin corridor between creations which can bring those dimensional "monsters" to Erebus.
Divine line replaces current gods' worship totally. They can adopt any religion but the consequences are different. Each "normal" religion has an "elder being" tied to it. The dimensional monsters cannot normally "enter" the creation, but they can "cling" to a power which is produced by worship. So cultists will be able to drag "appropriate" powers from their masters, so while adopting "Fellowship of Leaves" cultists will be able to use a power of a parazitic "elder being" which uses plant-like minions to harm and infest their foes and to protect your lands, while adopting Octopus Overlords will give you a Cthulhu-like Elder Being's patronage which comes along the line.
I want to revamp the arcane line to make it permanent-summon based. The mages and archmages should be replaced by "mystic" unit which is able to summon elder one's minions (religion based, or some less powerful minions if you have no religions) which can increase a "terror counter".
Your mystics should be able to open a gate which randomly summons weaker monsters. These monsters may "chew on" your cities, causing unhappiness but increasing a special "terror counter". When it's high enough, you will get more powerful monsters which may frighten AI's cities. Also there's a chance for abominations to go on a bloody rampage after they haunt a city (turn barbarian) so you'll need to control this process.
I have a basic idea on unit line which I will post later.
Leaders.
Don Vinchenzo
Aggressive
Adaptive
Financial
Units.
Courier - (Scout)
May conduct a trade mission (minor gold).
Mob - (Warrior)
A mob of angry, almost crazed people lusting for blood. They literally tear their rivals apart.
Starts with Cannibalize promotion
Has a chance to recieve "enraged" upon defeating an enemy.
Gang - (Axeman)
Concept not thinked through yet, however the idea is that if you train this unit directly it has it's own stats, and if you upgrade it from the Mob it recieves Cannibalize promotion and ability to become enraged