A Forsaken reaches the pinnacle of power when he masters death itself, transcends it.
This power over death requires the same delicate touch of any other power. A Forsaken must not kill indiscriminately, nor can he withhold death from the weak.
To kill wantonly escalates the Forsaken's risk of encountering power too great for him to overcome. It also robs him of his strength; a Forsaken who spends all day slaying wildlife and human peasants might exhaust his power, and be left defenseless when a true threat arises. Likewise, a Forsaken who shows mercy to the weak and forgoes regular exercise of his power may gain a reputation for weakness himself.
This draws predators and offends the cult. He must always preserve a balance.