Jewelry NPC can buy the most comprehensive purple drawings (and blue ones), and each prestigious NPC will sell you two drawings. In the Winter Swimming Lake battlefield NPC, there are PVP blue jewelry drawings exchanged for blue guardian fragments, and it seems that Stormwind Honor Hall also sells them?

In the 5-player hero FB, if there are jewels in the team, the drawings will fall (if they are learned, they will not fall, but will be tied up), and some special monsters in the wild will fall some blue drawings with fixed attributes, such as the black angel of the storm will fall 16 armor penetration! There are also things that have fallen from the world, ah, you can buy them all, including some blue jewels and colored drawings!