Question about Encyclopædia of Wamphyrism

Hi all. I’m not sure if I am understanding things right. Now as I research Encyclopædia of Wamphyrism, it seems to mostly be about just absorbing energy and what your state will be after you die. I just want to know. Is there anything at all with those practices that involve reshaping your current reality? Impacting how someone is towards you, your circumstances, etc. Also, the rituals in the grimore itself, can they all be performed inside?