None, the stranger said it. She said the hive is one evil but not the worst, then she said the vex is a despicable evil that hates other evils, but their is one true evil and i think its the guardians, the guardians will be forced to turn on themselves. Making it crucible wise a great idea, story wise amazing. Think about it vanguard fighting against corrupt guardians, small groups of gauardians forced into small resistances like osiris and other famous guardians have done. Forced to fight for survival with or againsr the other evils that plagie th galaxy, all to gain access to the traveler to end it all.