The Crimson Cloak is the most common enemy in Infernium. It is invisible but you can see him because he is wearing that characteristic crimson cloth.
It is the slowest enemy and they are not very dangerous. However, if the player is focusing on controlling another faster enemy like the Blue Cloak or the Dark Cloak it is highly possible for the Crimson Cloak to catch you by surprise.
Always keep an eye on them. Explore your surroundings to know you are not at a dead end and you won't have trouble dealing with them most of the time.