The Cube system explained

The 8 Cube functions and their unlock Cube Levels

• Cube Lv 1 — Synthesis (free, default unlocked)
• Cube Lv 1 — Alchemy (10 gold to unlock)
• Cube Lv 5 — Crafting (100 gold)
• Cube Lv 8 — Decoration (300 gold)
• Cube Lv 10 — Extraction (1,000 gold)
• Cube Lv 15 — Engraving (1,000 gold)
• Cube Lv 20 — Offering (3,000 gold)
• Cube Lv 25 — Inscription (10,000 gold)

When to use each

1. 1
   Synthesis (Lv 1)

   Feed 5 items in, get 1 random output at the same tier or higher. Use it constantly in the early game — it's the cheapest way to level up gear and the Cube itself.

2. 2
   Alchemy (Lv 1)

   Convert junk gear into gold. Run it on commons and uncommons that don't fit your build. Don't alchemize anything with a stat mod you might want to extract later.

3. 3
   Crafting (Lv 5)

   Deterministic. You spend materials and get the exact gear piece the recipe names. Use it when you need a specific stat baseline that Synthesis won't reliably produce.

4. 4
   Decoration (Lv 8)

   Adds cosmetic gem slots to gear pieces. Purely visual — no combat stats — but the slots persist when you upgrade the piece.

5. 5
   Extraction (Lv 10)

   Pulls a stat mod off a piece you're about to discard. Cost scales with mod tier. Useful for migrating a +Drop Chance or +Crit roll between accessories.

6. 6
   Engraving (Lv 15)

   Permanently inscribes a stat line onto a piece. Much more reliable than re-rolling — once it's engraved, it stays through every subsequent upgrade.

7. 7
   Offering (Lv 20)

   Trades a stack of materials for a guaranteed item from a curated pool. Best gold-to-result ratio in the late game; see the Offering page for the per-tier pools.

8. 8
   Inscription (Lv 25)

   Applies a best-in-slot mod from your stash onto a piece. Endgame finisher — 10,000 gold per recipe slot, so save it for your final BiS.