Ivan Regulus

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"So that's why you were confident." Charles said after a moment of shock. "You do know that the places you're after are extremely dangerous. Right?"

"I am aware." Raven said with confidence. There's probably no other person in this entire plane who knows that true terrors of the Four Extremes more than he does. 

Raven was also not surprised that Charles had also heard about the Four Extremes. If his guesses were correct, then he must've read some records left by their founders, which allowed him to be aware of the term. 

"If that's the case then there's no stopping you. But I still advice you to be very careful on your journey." Charles reminded kindly, "I've read some records about those places. It didn't contain much, but it repeatedly emphasized the dangers of those places."

And it appears that Raven's hunch was correct. Charles really did read some records left behind by their founders.