https://bugs.freedesktop.org/show_bug.cgi?id=99136
--- Comment #20 from Gregor Münch gr.muench@gmail.com --- (In reply to Samuel Pitoiset from comment #19)
Created attachment 129356 [details] no blood effects option (v 1.5)
Maybe you need the Blood DLC? (just wild guess) http://store.steampowered.com/app/404011/