Haze Panthers
 

The haze panthers in WL are visible but in live they round invis and you need see invis for see or track them, it break when attack a players or when players engage them.

See the allakhazam coments : a hanze panther

Fixed, pending update.

I was going to wait a while to ruin this one. :)

Haze Panthers also have an extremely annoying function where they chain GATE when they get low hitpoints.