Alex began his attempts to break through the Seal into his Soul Space. From what he was aware of at the moment, the seal on his Soul Space and his Spiritual Sea were two separate seals.
He had to break them individually.
So, he focused on the seal in his Soul Space first, since that was the one in the most danger right now. There was a chance that his Spiritual Sea had something similarly dangerous happening too, but between the two, he had to choose his Soul Space.
His Spiritual Sea only carried Godslayer and Midnight, but his Soul Space carried literally everything else he had ever gathered. As tough as the choice was, Alex had to go with his Soul Space first.
Hopefully, learning how to break through the Seal surrounding his Soul Space would help him with destroying the seal around his Spiritual Sea as well.
