I am using Requiem and I found the Soul Cairn filled with invisible entities. They really annoy me and I am having a hard time dealing with them.

I am a stealth based character using a dagger and bow. However I fail to sneak past them and I cannot beat them with my weapons before they beat me.

I am level 27 at the time so I figured I should be able to beat the Dawnguard DLC by now.

Does anyone got some tips for me? Or does anyone know of a way to remove the invisible entities from Requiem?