Incandescent husk/doc

This is the evolved form of the shocker zombie after 28 days.

It can't shoot lightning, but it emits a constant electric field around itself that will rapidly kill you if you're too close, shorts out electronics near it, and ignites flammable liquid near it. That includes gas pumps. Luckily, they are rather slow, so you can lead them to some place where they won't be a problem, run away, or simply take your time shooting them from a safe distance.

Tossing an EMP grenade or otherwise EMPing the husk will stop its electrical field for about 5 minutes.

Lightning can strike the husk, which causes its field to be massive, it to move twice as fast, and it to emit constant loud buzzing. This usually kills other zombies near it, but makes it hugely dangerous for the day or so that it lasts.