Wow, I did not know this. What equipment do you buy with that 15B, if I may ask?
1. Armor: Exalted (no buy)
2. Weapon: Exalted? (no buy)
3. Circlet: +5 Authority Circlet from Quest (no buy); Maybe upgrade it to Noble or Radiant buying Dawn crystals for a few billion adena?
4. Cloak? Buy 30 Day Nevit Cloak for a few hundred million? I never see Elmore +10 for cheaper than 20B, so can't afford that.
5. T-Shirt (no buy, maybe -- you get Dragon shirt, but only after completing 2nd Exalted quest. 80,000 mobs later. Do you use the Blaze Subclass shirt until then? Or buy Istina/Octavus shirt from AH for 100M-200M?)
6. Jewelry: Get Boss jewels from L2 store for $25 USD? Or buy low end old boss and angel jewels from AH for around 5B adena?
7. With 10B left can I get dyes, artifacts, artifact books, mystic life stone, brooch, Stage 4 brooch jewels (I know we get Stage 3 from Exalted quest), agathion, talismans, and everything else I need for my Evi to own mobs my level? I want to get to 110 quickly. Only one week left in XP event.