I suggest to add hidden Mastercrafts learning ways, after completing some tasks you would get blueprint
Formula's colors are connected with each other:
{number}Lvl. + Note: {Explorer}{#number} + {number}{repairing/crafting/hunting/taming} Exp. = {item}{quality}Blueprint
How we get quality:
{number}Lvl. + Note: {explorer} => {quality}
35 Lvl. + Note: {Rockwell} = Ramshackle
45 Lvl. + Note: {Helena} = Apprentice
55 Lvl. + Note: {???} = Journeyman
65 Lvl. + Note: {Nerva} = Mastercraft
75 Lvl. + Note: {Meiyin} = Ascendant
How we get item: