Vision of an inevitable future
This meant that he was stuck, no matter how much EXP he had he would never be able to breakthrough to rank 4.
He thought that he had limitless growth potential but that was not exactly the case. It seems like the divine shard came with its limitations and conditions.
He could not help but think that it was a deliberate design. Think about it, if someone else got this shard and wanted to simply farm EXP and rise in ranks infinitely they would have no insensitive to gather the rest of the shards.
However, these circumstances forced him into a pinch. The Queen of dusk was a rank 5 being and he was limited to rank 3.
If he wanted to save Celine's soul before the apocalypse he had to get his hands on not one but two more shards to raise his rank limit to rank 5.
There was another problem with this, he was forced to wait for the apocalypse to start if he wanted to achieve rank 5.