Lots and lots of lore. From what you say, it sounds like you are on the Umbrite step. This is basically a lore sinkhole, so I would suggest dumping all of you're lore into buying umbrites ( 300 tomes each ). The other half of this is Sands, which there are many different ways to get sands, and you'll just have to look at the trade-in options and pick what is best for you, Various methods I have used to get sands, Doing Leve's for chests and turning in Vilekin, Spending poetics on sup inks / Thav mists, Using GC seals to buy moonstones to turn in as well, Gathering and crafting blue scrips work as well if you do any of that. I'd say focus mainly on umbrite and the sands will come as they are the easier side of the quest.