cor will allways be a desirable job not so much as a dd but as a buffer/dd and rng is all the rage these days. the main ammo in the game you buy with a currency you get from doing delve (endgame) but don't worry you can get enough currency for 2 stacks of these bullets from a failed delve run so its easy to get, thf seems to be a for yourself job these days as I rarely see it in endgame (but I could be wrong as I rarely play it) hope this answers your question