The ideas behind That Wich Sleeps was very interesting (but the developpement is dead). To summarize, you are an old evil, vainquished in a long and nearly forgotten past and you try to make a discret return (at first). So you recruit agent and try to destabilize/corrupt/submit nation, dirigeant, heroes, etc, by every means possible (magic, good old assassination, armies controller by some of your agents, etc).
I think this clearly in the Paradox skills because this needed a "alive" world with many independant agent in interaction, like we can see in CK2, with a more important focus on individual characters.