Deep Fissure should be frost damage, and the animation should be ice wraiths and ice spikes.
You know it. I know it. Everybody knows it.
Think about it: it fits the class theme just as much or even more appropriately, and makes more logical sense that it would cause Major Breach when a barrage up ice spikes shoots up your bum than a few ugly bugs.
The base morph and the stamina version can remain as-is, which means all the hard VFX work was not for naught. You already have VFX in came for ice wraiths and ice spikes. Some VFX intern could get this done before lunch on a Monday.
This is the one thing holding us back from being able to play a proper Frost DD RP build. So many players want the option to play a FROST MAGE, but no class can fill the necessary gaps to make it possible. Warden was your one shot to give us what we crave and you dropped the ball. It's time. Please make this happen.