The Aurum set is now sold in the Donate Shop. Vesper has moved to the Event Shop.
From November 12 the Aurum set is sold in the Donate Shop. It is the next tier after Elegia.
Where to buy. Alt+B → "Donate" → "Equipment Creation": Aurum armor, weapons and jewelry come right after Elegia. The Aurum Cloak is in the "Shop" section, the Aurum Helmet (accessory) is in the "Accessories" section.
Vesper moved to the Event Shop. Vesper sets, weapons and jewelry are now sold for Event Medals; they are no longer in the Donate Shop.
If Aurum items are not displayed, restart the launcher: it will update your client.