I dont know what rad powers the shivans use, but they are helpful -- they add extra damage, and they use some rad-like powers. Really ANY pet would be good, for the extra damage, but shivans are nice in that you can get more of them when you use them up.
Also, warburg nukes are a good choice. If you dont like pvp, it cuold be a pain, but it *defeinately* made a difference when I used the EMP + Chemical warhead on the AV at the end of Manti's TF. (too bad Im out of nukes now... have to get me some more)
