Indeed, Asthon's Permanent Haven had some resistance to the powers of the Chronocle Fiend, but the reason wasn't what Grim had imagined. It wasn't because it was some special place with just that much of a uniqueness to it. Well, one could have worded it that way.
The reason was because… like a real world, the Permanent Haven was made of Asthon's own body. Any harm that was to befall the people inside the Haven had to interact with Asthon first and only when he was bested, would they be cast to harm.
When he had used the Permanent Haven the first time, the blows that banged on the Haven had reached him first, causing him pain none could have imagined. But it was of no consequence to the old bird as long as what he hoped to see was done.
His Permanent Haven could only be erected as many times as the Crown and Star were aglow. He had already expended a massive amount of energy with everything he tackled in his Haven the first time.