Vivamort has the runes of Chaos, Darkness, and Undead. Gark has the runes of Chaos, Stasis, and Undead.  There are lots of ways to animate the dead. Vivamort's and Gark's are chaotic, ZZ is not. There are also lots of ways to kill people - the Crimson Bat's methods are chaotic, Humakt and Zoran Zoran's are not.