Zatiel was extremely satisfied with the sword. It covers both long-range attacks and melee fights, perfectly complementing his battle style and the best of it was the blue flames.
A blue flame is the physical manifestation of the Law of Destruction in Baator and although it was far from the power that the Pit Fiend could have displayed because Zatiel was only able to activate 1% of the runes, it presented overwhelming might against Rank 3 life forms.
After sending a signal, the sword returned to its original size in an instant and the blue flames disappeared. before entering Zatiel's body and once again took the form of an exoskeleton around with his spine.
There were thousands of people looking at the sky from all parts of the City of the Sun and you could see how their eyes sparkled as they saw Zatiel.