> elemental damage.
For some reasons i also always thought that he does mind damage, but its wrong, he only does energy damage and physical on his #3 skill.
Both are quite squishy imho and noe of them would be my choice for WBU, but WM is much easier to build.
On the other hand Maws uniform give +25% extra damage against universal types, so he can be used as support char in WBU.
I always assumed it because mind-control and stuff simply sounded a lot like mental damage type i think.
But energy damage works ok against Maw, elemental is just a lot better. But he is only totally immune to physical.