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I feel like Devoronox should give you health recovery of draining the person's since it says "draining their life energy." So maybe it can be used a health drain spell.
Thank you for bringing this idea up to us! I'll bring it up to the rest of the Team, we'll discuss it and then get back to you once we have a decision!
Unfortunately, we have decided to decline this suggestion because we think this change would be too difficult to balance. Also because of the way the spell works at the moment, it would generally be very difficult to figure out a way to change it so that it heals the caster, as well as doing damage.
Finally, we also don't think this spell needs changes, as it is fairly balanced in our opinions, especially with different gear sets.
Thank you once again for making suggestions on the forums! We really appreciate you <3