The Comprehensive Guide
Genshin Artifact Substat Roll Simulator: Master the RNG of Teyvat
In Genshin Impact, the difference between a character that struggles and one that dominates is found in the sub-stats of their artifacts. we've all been there: you find a "double crit" piece at Level 0, and by Level 20, it's rolled entirely into Flat DEF. The Genshin Artifact Substat Roll Simulator is designed to help you navigate this frustration by providing clear, data-driven probabilities for your upgrades.
How Artifact RNG Works in Genshin Impact
There are three layers of RNG involved every time you upgrade an artifact from 0 to 20. Understanding these layers is key to using the simulator effectively.
Level 1: The Reveal (Level 4)
A 5-star artifact can drop with either 3 or 4 sub-stats. If it has 3, the Level 4 upgrade will reveal a random 4th stat. This is the first hurdle. If the 4th stat is "Flat" or useless, your artifact already has a lower potential than a piece that started with 4 useful stats.
Level 2: The Target Selection
At levels 4 (if 4 stats exist), 8, 12, 16, and 20, the game picks one of the 4 sub-stats to upgrade. Contrary to popular belief, these are not equally weighted. Community data collection from millions of artifacts suggests that the game favors "Defense" and "HP" stats over "Crit" stats.
Estimated Weights:
- Flat HP/ATK/DEF: 15% each
- HP%/ATK%/DEF%: 10% each
- EM/ER: 8% each
- Crit Rate/Crit DMG: 7.5% each
Level 3: The Roll Value
Once a stat is chosen, the game doesn't just add a fixed amount. It picks from one of four tiers (70%, 80%, 90%, or 100% of the max value). For example, Crit DMG can roll 5.4%, 6.2%, 7.0%, or 7.8%. A "God-Tier" artifact requires both the stat target luck and the roll value luck.
The Math of "God-Tier" Artifacts
What are the odds of getting that 40+ CV (Crit Value) piece? Let's look at the simulation results for a "Perfect Starter" (Crit Rate and Crit DMG already present at Level 0).
| Desired CV Outcome | 3-Substat Start Probability | 4-Substat Start Probability | Resin Estimate |
|---|---|---|---|
| 20 - 30 CV (Decent) | 35.0% | 55.0% | ~200 Resin |
| 30 - 35 CV (Good) | 12.0% | 22.0% | ~800 Resin |
| 35 - 42 CV (Great) | 2.5% | 6.5% | ~2,500 Resin |
| 42 - 50 CV (God-Tier) | 0.15% | 0.85% | ~15,000 Resin |
| 50+ CV (Mythic) | ~0.01% | ~0.04% | ~80,000+ Resin |
Why the Simulator is Better Than "Luck"
Using the simulator allows you to practice "Resin Management." Rather than dumping all your resources into one artifact, you can simulate the potential of several pieces. If the simulator shows that a particular Sand has only a 5% chance of being better than what you currently have, it's better to save your fodder and Mora for a different piece with a higher statistical ceiling.
Strategies for Optimizing Sub-stat Rolls
- The +4 Rule: Always take 3-substat double-crit pieces to Level 4. If the 4th stat is Dead (Flat), seriously consider whether the piece is worth more investment.
- The +12 Breakpoint: At Level 12, an artifact has received 3 upgrade rolls. If all 3 missed your desired stats, the maximum CV you can reach is significantly capped. It is usually more efficient to stop here and use this piece as fodder for a more promising one.
- Utility Matching: Don't just simulate for Crit. For characters like Nahida or Alhaitham, Elemental Mastery (EM) is just as valuable. A 20 CV piece with 80 EM might be better than a 30 CV piece with 0 EM.
Frequently Asked Questions (Fanning the RNG)
Does the game "rig" the results?
While players often joke about "DEF impact," the statistical reality is that different stats have different weights. This isn't "rigging" in the illegal sense, but it is a designed scarcity to prolong the endgame loop. Our simulator accounts for these weights.
What is the most rare sub-stat?
Crit Rate and Crit DMG are tied for the lowest spawn and roll weights. This makes them the hardest to "stack" on a single piece.
Can I influence the RNG by standing in a specific spot?
No. Artifact roll results are determined by the server's random number generator at the moment you click "Upgrade." In-game locations, character choice, or "rituals" have no mathematical effect on the outcome.
Conclusion: Logic Over Emotion
Artifact upgrading is the most emotional part of Genshin Impact. The high of a 40 CV piece and the low of a "Full DEF" roll can affect your enjoyment of the game. By using the Genshin Artifact Substat Roll Simulator, you replace emotion with logic. You'll understand the odds, accept the math, and ultimately build stronger characters by making smarter investment choices. Good luck on your next +20, Traveler!