You answered your own question go lvl up and get like 75+ or 76+ don't remember and GC, DoE etc will change to high level locations, mobs will be 80+. You can spoil moirai recipes near oren where ~lvl 50 or so 1/2 hp mobs are or in other words, where that npc for subclass is. Once you reach high level there will be different mobs.
That is very awesome that mobs' lvls change once you reach certain level, that way you can get A grade recipes and other stuff without problems. For example tallum h body armor can be obtain via quests in GC, but in other l2j servers there were only 2 mobs for whole server, which could be spoiled for those recs.
