[Edit]Czeslaw has been an immortal since 1711- aboard the Advent Avis ship where he gained access to immortality. He’d set sail along with his father figure and guardian- Fermet. After that event, Fermet set him up as his personal ‘lab rat’ and imploded many life-threatening experiments on his body. Czeslaw, only around the age of 10 at the time, suffered obnoxiously from the so-called "experiments". He later turns to ‘eat’ his guardian, and became mentally scarred and aware as to what horrendous nature immortality can inflict upon humans.
After that traumatic event, Czeslaw suffered from shock and felt very threatened. He became rather paranoid and convinced that the other immortals are out to get him. He’s pushed into a delusional state that he must "eat" them before they can "eat" him. For the past 200 years he has been keeping a low profile and secretly manipulates people into crimes of killing another if he suspects them of also being an immortal.