Rook

A virus who has lived longer than any other known to the world of dreamwalkers. Rook has been collecting minions, also known as dogs, for years now and is reaching the point where he may be unstoppable.

Rook attacks humans in the real world, infects their subconsiousness and starts taking it over. As he does this, he finds the subconsious representation of the sleeping human and pretends to be there to help, leading them on a fruitless chase. Distracting them just long enough for it to be too late for them to stop him from turning them into another one of his dogs.