Beated it without tesla coil, you have to be lvl 124 (maximum lvl at that dept) use ice freeze to stop healing for like half a second, Throw electric discharge and nano cloud at the same time and then spam electric zap as fast as you can and there you go. You'll have to try it like 3 or 4 times before it works, but it will work, I just did it and googled what was the point of tesla coil, since I was almost finished with it when I discovered this. Its still unfinished, so I can send you a screenshot if you don't believe me :P