What map version are you currently playing? And what bug is there with Essence Shift?
Here are some BUG we had found:
1.Markmanship provide extra damage for AGI heros. (Level 1 +80; Level 2 +120; Level 3 +160)
2. If you using the snowball to a hero who is bing affecting by the Primal Roar, you will disappear forever.
Similarly, if you using the Primal Roar to a hero in the area of Magnetic Field, you will get the perpetual effect from Magnetic Field.
3.There are still a BUG came from the Denique. When you using this skill to copy some transformative skill like Chemical Rage or True form, you may (by chance) get the effect of Full Disables.
4.Still, if you using the Ice Blast to kill your enemy, he will become invulnerable (also by chance).
5.The last is a serious invulnerable BUG which we found many times but we cannot understand a little about it.
We analyzed those rep, but cannot find any same skill which seems caused this BUG.
The hero just died as usual, and then, unexpected become invulnerable, or, he just not lose HP.