IT IS DISPELLABLE!!!
Seriously, I just recently found! That really surprised me as I had lethal and otherwise would have died the next turn so I decided to try to use Empheral Shroud as a desperate last attempt and it worked!
Anyway the card is not op or anything, it can be annoying but the mechanic existed before in the form of Falcius for example (which I still hate btw, so much value…).
It reminds me of Freeze Mage from HS which works in a similar manner, making herself invincible for a turn in order to stall a while longer to draw the last bits of burst. Yea, sure annoying, not the funnest, but can be dealt with.
In HS you had to play around the secret while in Duelyst you can simply dispel it or position yourself/ heal timely to dodge lethal.

. That must be because, at least in my experience, his body isn’t that helpful. Shroud may not leave a body behind, but I still think it is stronger than Falcius because it works better with cheap Vanar artifacts then expensive Vetruvian artifacts, not to mention that spells can be used in more combos than a weak body with opening gambit.