Numbering in the thousands, Divine Assassins are dead flesh, processed by the Divine Order's "Bio-Scholars" under the direct supervision of the Grand Bio-Vizier. They are decarbonized, removing any trace of organic material, and cybernetically augmented. As a result, Divine Assassins are very nearly indestructible. Their only weaknesses are their dependence on protoblood, a liquid that is necessary to animate them, and an inability to swim (due to the increased density of decarbonized flesh).
The body of a Divine Assassin is polymorphic. If one is sliced in half, one would simply rejoin the two parts.
When a Divine Assassin is no longer needed or fails to behave as expected, His Shadow calls on a special subset of Divine Assassins called Divine Executioners. Divine Executioners are far more deadly than regular Divine Assassins. As Kai said, "If Divine Assassins are Death incarnate, then Divine Executioners are the Apocalypse made flesh." These two classes compete for protoblood. An interesting paradox develops here because Divine Assassins are designed to be immortal, to always survive, a concept developed in Lexx 4.18 "The Game".