Second idea :) Thought i would spend more time on the story with this one.

Story
The arrow shot through the air, Embedding itself in a tree. The rangers continued to move forward, Pursuing what seemed like mere shadows, However, They knew what it was, It had evaded them for the last time. One of the youngest rangers moved closer, Ignoring the whispers of the others, Out of no where it came, Ripping through him almost instantly, The creature moved towards them at a lightning fast speed, Again the arrows flew through the air. But to no avail... The creature swept through them, As if part of the shadows, Taking each of them down. Quinn knew he had no chance and made a run for it, Barely managing to get out of the woods before the shadows engulfed every inch of the trees. He was left staring at complete darkness.

From then on chaos reigned, It swept Through, Conquering town after town, Engulfing lands into darkness. Following it, Was an army, The victims the darkness took were re-animated, Following the darkness wherever it went, The creatures would follow their basic insticts to kill, And would do it far better then any army could.

The lords by now had fallen from power, They could no longer control their peasants, Civil revolts took place at every corner of the lands. The darkness seemed to be empowered by this, And swept over the lands..Corrupting the rioting Peasants, Growing stronger and stronger.

A week had passed, And the darkness was preparing to take over.

Gameplay
Highly based on alignment, You can become part of the army of darkness, In the ranks of the darkness, A solider of light, One of the few who stand up against the vile darkness, Prepared to fight to the death.

Or maybe you would prefer to stay neutral? Figure out whats going on, Maybe lead to some sort of balance.

Special features
Tough one. I suppose the advancements would be a special feature, because of the Army vs Army basis, There would be ranks, advancements improvements and what not.

Thoughts
I really like this one, Mainly for the story, i think the gameplay needs pleanty of work though.