The crit bonus ones? Once you zone into Thalumbra, by portal, run to the road. You still see some NPCs on a little platform, they are there. There is also a merchant in Neriak and Kelethin.
I think you can buy them with the new sovereign of rile tokens from the elf merchant in OF. Before that, they came form the prelude PQs
They are almost impossible to get now. The vendor for the book is still at least in Neriak, likely Thalumbra and Kelethin. You need 1200 Crusader's Medal, which only come from the big PQ in Thalumbra that requires defeating an EpicX4 ... at 60 medals per PQ as a member, that is 20 times if you are starting from zero medals. Guess how many people want to run that PQ these days? The defender's medals that you can convert in OF do not work.
yup until that PQ is soloable you will need someone to craft them. Get the mats together and find a nice crafter who can do it for you. Each completion nets you two adorns.Use your 500DBC a month and XPvials to get them made.