Confused!? How to get Herscher of Finality?

So I havent spent a single annulon and im at 475. It says you need 800 but the only available missions are giving 50, and 25. Am i missing something. Can someone tell me how to still get her?

So I havent spent a single annulon and im at 475. It says you need 800 but the only available missions are giving 50, and 25. Am i missing something. Can someone tell me how to still get her?