For me its [aneurysm] in Fort Aspenwood
The fact you can hit an Elementalist with average spikes of 120-250 range make it fun to use. Some people like high energy levels so it can go up. A spike of 351 is the most I have ever got
On the other hand using it against a warrior you get a 30ish point spike here and there, but still fun as a finisher on any character

And who cares about them getting energy back. They get the energy back anyway when they resurrect in FA.