My thoughts whilst reading:
°As I have Aziz sigil to block vampirisim onto thyself I will check it if he is asso with metals of iron or steel
° Left hand suck it right spread out or share the life force… If just wanting to practice on a set group of targets but not delete their essences or actually harm them simply modify the oval by colouring it blank and program it to only “Sip” not “Supp”.
If not using your own sigil use a pentagram either upright or inverse.
Use the right hand to Send headaches which derails most people, rather than heal or share absorbed energy
° Cause the life force to enter between palm with the oval drawn in both palms.
Then place into a fetish or tin with iron seal.
After that place a sealing sigil so the targets spirit is trapped.
Just an idea.