Some information is private, state secrets or magical secrets that can't be trusted with an outsider. Having that information would mark a person as a potential threat and something to be eliminated.
Most people don't like when Phelix talks about peaceful cooperation because they have strong attachment about torture, dismemberment and slavery as punishments against crimes and it's often not diplomatic to make Phelix known to be against those.
(This is might be some weird magic interaction with how they are vulnerable to mind magic.)
Oh, the Inevitable is a really weird figure, even for their standards. They know from history that he participated in a great many deals of wars and an even greater deals of conflicts where he ruthlessly destroyed the opposition and some legends even say that he turned a forest into a desert by desecrating with the blood of his enemies.
But on a personal level, the Inevitable played board games with the children of the moon. He didn't move, he stayed in constant deep meditation for the entire time they've known him, but would move pieces with his powers and even let children fly around his head sometimes. Also, he is definitely capable of some form of prescience, enhanced speed, enhanced tactical thinking, long ranged perception, weather control, and likely some form of immortality. He never actually spoke or communicated in words. They don't know what are his goals if any.