"Immunity Gained"
When someone tries to destroy a domain's clone, the real domain should not be too affected and would only be affected after the domain's clone was completely destroyed.
But that was for others. Axelle's domain had a unique devouring ability, and what it devoured was not only the clone but also the real domain!
Since there was an invisible connection between the clone and the real domain, the devouring power could go along this 'thread' just to devour the real body of the domain.
It was very rare for the real body of the domain to break down severely, and once the real domain was destroyed, that would be the death of the domain master.
When a domain master died, their real domain would still exist somewhere in space crack and other places, becoming ownerless domains that people often called as wandering dimensions.