Background
Zeit is a Holy Beast dispatched by Aidios to look after Demiourgos, the Sept-Terrion of Mirage. He has lived in Crossbell since ancient times. The legendary novel The Saint and the White Wolf is based on Zeit's appearance throughout history.
Special Support Section
Zeit facing Revache member Garcia Rossi at the entrance of Mishelam.
Zeit and the S.S.S. became acquainted with one another when the S.S.S. began investigating mysterious armored dog sightings and attacks that had been orchestrated by Revache. After the S.S.S. exposed Revache's involvement with the attacks, Zeit assisted the S.S.S. by repelling Revache's reinforcements and preventing their getaway. After these events, he visited the S.S.S. headquarters and told Tio Plato he was willing to lend them a paw. Although he cannot speak with humans normally, Zeit was able to communicate with Tio thanks to her heightened senses of hearing and KeA as the Sept-Terrion of Zero.
S.S.S. chief Sergei Lou discussed Zeit's offer with the top brass of the Crossbell Police Department and registered him as a police dog, giving him a collar in the process. They were initially worried whether Crossbellans would be scared of him, but after saving a child from a car accident he immediately became a fan favorite of the citizenry. From that point onward, Zeit took on a vital role of protecting the S.S.S. members from harm and acting as a helper during battles using Tio's summon craft.
Holy Beast
Zeit escorting Lloyd after having revealed his true form as Holy Beast.
After Lloyd Bannings escapes from Knox Prison, Zeit comes in to rescue Lloyd after he gets cornered by the Crossbell Defense Force. After chasing off the army, Zeit gives Lloyd a ride out of Knox Forest and reveals his true identity as the Holy Beast who was entrusted by Aidios to protect the Sept-Terrion of Mirage. He also informs Lloyd that he had also been following the plans of the Crois family and explains the secrets behind KeA's birth and Demiourgos. Lloyd makes up his mind to save KeA, to which Zeit pledges his full support.
Despite his pledge, Zeit was only charged to watch over the Sept-Terrion and was not permitted to interfere with events regarding it. However, when the original Demiourgos vanished from existence, he was released from his oath with Aidios and was still able to lend his strength to the S.S.S. and protect KeA.
Departure
Zeit leaving Crossbell at the end of Ao no Kiseki.
References
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