Gameforge's Dragon Stone Alchemy guide identifies seven Dragon Stone types and describes class, purity and level as three enhancement tiers. Its beginner guidance recommends prioritizing class because higher classes can provide more bonuses.
Upgrade structure
The Gameforge-hosted Metin2 Wiki lists six classes: Rough, Cut, Rare, Antique, Legendary and Mythic. It lists five clarity grades: Matt, Clear, Flawless, Brilliant and Excellent.
Stone levels range from +1 to +6, but the maximum depends on clarity:
- Matt through Flawless: +4
- Brilliant: +5
- Excellent: +6
- Each attempt requires two stones at the current class or clarity.
- Success produces the next class or clarity.
- Failure returns one stone at the current class or clarity.
What to upgrade first
Gameforge's beginner recommendation is to prioritize class before investing heavily in purity or level. The guide explains that class determines how many bonuses a stone can have, while purity and level increase bonus strength or effect.
Expected cost for class or clarity refinement
The following model applies only when:
- Each attempt follows the documented two-stone recipe.
- A failure returns one compatible current-stage stone.
- Attempts are independent and have a constant success probability.
- Compatible current-stage stones are each valued at the same amount.
- C be the cost or value of one compatible current-stage stone.
- p be the success probability for each attempt, expressed as a decimal greater than zero.
- F be the fee for each attempt.
The successful attempt consumes two stones. Each preceding failure consumes one net stone because one of the two stones is returned. Expected stone consumption is consequently:
2 + (1-p)/p = 1 + 1/p
The expected total cost is:
Expected cost = C × (1 + 1/p) + F/p
This is a long-run average under the stated assumptions, not a guarantee or spending limit for one refinement. It cannot produce a numerical estimate unless the applicable success probability, stone value and fee are known.
Do not apply this formula to level refinement. Level-refinement failures have different outcomes and can reduce the stone's level.
Sources and verification
- Metin2 Dragon Stone Alchemy Guide – All Info — Supports the seven Dragon Stone types, the class-purity-level enhancement structure, the effects of those tiers and the beginner recommendation to prioritize class.
- Dragon Stone Alchemy — Metin2 Wiki — Documents the class and clarity sequences, clarity-dependent level limits, two-stone class and clarity recipes, failure returns, Dragon Beans and level-refinement failure outcomes.
- Geometric and Negative Binomial Distributions — STAT 414 — Supports the geometric-distribution model and the expected 1/p attempts until the first success under independent trials with constant success probability.