As soon as Rex departed to the Spirit Realm, the newest members of the Silverstar Pack—Jarvald and Vivian informed the others. Both explained through telepathy that Rex and Linthia had trailed into the Spirit Realm and the castle was in lockdown.
Ryze is overseeing the castle as the highest chain of command until the others come back.
And he would be watching over Rex's real body himself.
Nothing went wrong along the process.
But the news struck the others badly, especially Evelyn who was hit the hardest.
Rex has told them that his departure would be coming soon but turns out, he departed without anyone knowing—leaving without saying goodbye. Of course, the others asked whether he had left anything, a message or an order for them.
Regretfully, Vivian said that he didn't say anything.
It was hopeful of them that Rex would give them some words of encouragement.
However, this was aligned with how he had always been.