Orpal's empty stomach, wounded ego, and lack of human interaction for months had driven him to the brink of insanity, something that she couldn't allow to happen.
Without Orpal, Night had no way to get revenge on Lith and without it, she had nothing left. Her Court had betrayed her, her mother was hunting her down, and the spell to destroy her crystal body was now public knowledge.
'If this moron's mind shatters, everything I've sacrificed so far will be for nothing!' So she had him take a break from his training from time to time and join an Awakened human city.
Orpal had prepared countless aliases for his Balkor copycat plan and his shapeshifting abilities were remarkable. As long as Night remained sealed within his chest, no one would perceive her and on Jiera no one knew his energy signature.