"Even if they accept me, what good is wealth if you never have the time to enjoy it? If we follow your plan, you'll die as you've lived, like a tool. If we do as I say, instead, we'll be the one on top and the Royals will grovel at our feet."
Dawn neglected to mention the part where she would erode his mind, take control of his body, and use everything they would be rewarded with to pursue her own personal agenda.
She wasn't as naïve, empathetic, and kind as Solus back when she had first met Lith.
Everything the Bright Day had explained and taught to the Ranger after they bonded came with a price. The more Acala relied on Dawn's abilities, the more she was able to manipulate his thoughts and actions.
Constantly having a voice in his head and a whisper in his ears even while he was asleep, had thinned the boundary between their personalities until Dawn had become the dominant and Acala her servant.