1. Disable everything you can to increase your odds of receiving the Leeching Crystal item in your reward pool.
2. Bind "Quick Reset" if you haven't already.
3. Forest. Tier 1. Turbo Mode Challenge.
4. Build
| Robinette
⌊ Gold Tome, XP Tome, Luck Tome, Cursed Tome
⌊ Any weapons you like. Clear is much more important than single target here.

If you don't spawn near any Moai Stones or Shady Dealers, reset.
Build up luck as quickly as you can
Prioritize Shady Dealers and Maoi Stones, spam chests when you have ~200 gold and 30-40% luck increase.
Banish any blues that aren't Leeching Crystal.
If you don't get it before the timer reaches ~3min remaining or the chest price reaches ~1500g just reset.