Volcanic glass with murderous edges. Forged into armor it grows Volcanic Glass Spines for heavy thorns.
Razor spines of volcanic glass retaliate on contact.
How the waterline works. The game counts Obsidian's share of the total crucible: under 10% the trait is INACTIVE; 10–30% it scales linearly (SCALING); 30–35% is OPTIMAL (full 16%); past 35% it is OVERCAP — the trait stays maxed but the extra ores are wasted multiplier.
Exact top-up formula. Adding Δ ores also grows the total N, so the real formula is Δ₁₀ = ceil((N − 10n) / 9) for the 10% line and Δ₃₀ = ceil((3N − 10n) / 7) for the 30% sweet spot — never the naive "fill to 30%".
Worked example. Say your 50-ore crucible already holds 8 Obsidian (16%, SCALING at 11.8%). To max out you need +10 more — landing at 18/60 = exactly 30%. And a tiny 30-ore forge holding 2 Obsidian needs +2 to wake the trait (4/32 = 12.5%).
| Source | World | Chance |
|---|---|---|
| Magma Vein | Frostspire Expanse | 20.8% (20.8%) |
Volcanic Glass Spines applies to armor — these solver picks pin Obsidian at the 30% sweet spot on the best armor of its stage, the Glacier Plate.
Trait coverage: Obsidian 30% OPTIMAL
Highest score: 1027.8 EHP on Glacier Plate at 38.5% per forge — the no-compromise endgame recipe.
⚡ Load in CalculatorTrait coverage: Obsidian 30% OPTIMAL
60 ores divides cleanly by 30% — every trait ore sits at exactly the sweet spot with zero rounding waste.
⚡ Load in CalculatorTrait coverage: Obsidian 30% OPTIMAL
Built entirely from mined and crafted ores — no Tower of Hell drops or event items required.
⚡ Load in CalculatorEach recipe loads straight into the crucible with ores, RNG lock and target pre-set. Odds are per forge at the recipe's anvil world.
| Ore | Multiplier | Sell | Trait |
|---|---|---|---|
| Frostbite Steel | 5x | $38 | — |
| Cryonite | 5.2x | $39 | — |
| Stormsilver | 4.8x | $36 | 🔥 Stormlash |
| Fireite | 5.5x | $41 | 🔥 Cauterizing Brand |
| Magma | 4.5x | $34 | — |
| Frostforged Steel | 5.6x | $42 | — |
| Aurora Ore | 4.4x | $33 | — |
| Frozen Heart | 5.8x | $44 | 🔥 Heart of Winter |
| Shiversteel | 4.2x | $32 | — |
| Skyquartz | 6x | $45 | — |
Obsidian carries a 5x crucible multiplier — A tier, epic rarity — sourced from Frostspire Expanse. A crucible loaded entirely with Obsidian forges at exactly 5x.
Volcanic Glass Spines caps at 30% of the crucible load: ceil(0.3 × N) ores — 15 Obsidian in a 50-ore forge. At 10% it activates at 10%, reaching the full 16% at 30%.
Magma Vein (Frostspire Expanse) at 20.8%.
Obsidian is a solid mid-game ore — respectable 5x multiplier plus the Volcanic Glass Spines trait for armor.