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His trip to the Spirit Universe this time might bring encounters with Divine Realm powerhouses, but it wasn't certain to happen. By saving a bit of the Power of Time, as long as he didn't face an overwhelmingly powerful Divine Realm adversary, he was confident in his ability to cope. At worst, he could flee. And if all else failed, it would just mean his demise.
His life's Spirituality had connected with that Spirit Universe. As long as that universe was indestructible, he wouldn't die.
He also had an alternative self in that Spirit Universe; even if his body here perished, he could condense another and it wouldn't really matter.
The only concern was for the safety of Little Ear and Purple Cloud.
However, if he indeed encountered a Divine Realm powerhouse that could threaten his life, even a substantial reserve of the Power of Time might not be enough to overcome the threat, and Little Ear and Purple Cloud would still be in danger.