Solo leveling

In the year 2500 Something me called "Gates" appeared suddenly and monsters and beast came out of it and then people all around the world awaken ability's to fight against them they are called vanguards there are 9 ranks from weakest to strongest E rank,D rank,C rank,B rank,A rank,S rank,SS rank,SSS rank, And at the very top with only 10 people National Rank but ever so often there can be red Gates which usually mean evenmore dangerous beast it could also be A monarch trial gate with being 6 monarchs Shadow,Light,Fire,Ice,energy,Demon monarchs (Goodluck on your adventures)