If you're into the SCP Foundation, you'll know that a Foundation doctor, Dr. Bright, wears an amulet known as SCP-963. This amulet allows his soul to survive after death, making him practically immortal. Another effect of this, if, for whatever reason, Dr. Bright is not wearing SCP-963, anything that comes into contact with or wears the amulet will have Dr. Bright's conscience controlling them. The same goes for if something consumes Dr. Bright, (which btw would not permanently kill him), like the internet SCP-682 cross-test in which Dr. Bright was fed to SCP-682, but neither of them were killed.