170 mob entries drop at least one of the four. The mob pages show no spawn location and no drop rate, and the database keeps old entries under the same names; the site doesn't say which one spawns. BianKO's site also doesn't say what these materials are for or which craft uses them.
How many entries drop each item
| Item | Entries | List | Level range |
|---|---|---|---|
| Crystal | 147 | All group | 6–70 |
| Opal | 147 | All group | 6–70 |
| Low Quality Gem | 156 | All group; also a main drop on Bulcan 250 and Wild Bulcan 251 | 1–70 |
| Styx | 123 | All group | 1–70 |
| Refined gemstone | 7 | All group | 50–83 |
Characters have started at level 83 since April 28, 2025, so farming these means going back to low-level mobs. 100 entries drop all four together. 33 entries skip Styx (Crystal, Opal, Low Quality Gem); the wolf mobs Werewolf, Lycan, Lugaru, Dire Wolf, Shadow Seeker, Loup-garau, Dark Eyes and Watcher drop only Crystal and Opal (14 entries). Another 23 entries, such as Bandicoot, Worm, Earth Worm, Carrion Crawler and Snatcher, drop only Low Quality Gem and Styx.
Highest-level sources (level 50+)
All 15 entries below have Crystal, Opal, Low Quality Gem and Styx in their group drop.
| Mob (id) | Level | HP | Main drop |
|---|---|---|---|
| [Field Boss] Alkedrada (8663) | 70 | 20,000 | Alkeradeuas Essence |
| Dragon Tooth Commander (8003) | 69 | 10,557 | Yonga Knight Commanders Skull, Bone of Dragon tooth, Potion of Soul |
| Dragon Tooth Knight (1114 / 1164) | 65 | 7,123 | Bone of Dragon tooth, Potion of Sagacity |
| Dragon Tooth Soldier (8002) | 62 | 5,824 | Upgrade Scroll, Bone of Dragon tooth, Potion of Wisdom |
| Burning Skeleton (3601 / 3651) | 57 | 3,061 | Unsmelted Metal |
| Battalion (1002) | 55 | 5,014 | Oath of Darkness, Zombie Eye, Undying Bone |
| Ash Knight (1113) | 55 | 4,664 | Upgrade Scroll, Upgrade Scroll (Low Class Item), Monster Stone |
| Ash Knight (1163) | 55 | 4,664 | Cursed Bone, Potion of Sagacity |
| Shade Knight (8001) | 53 | 4,357 | Upgrade Scroll (Middle Class Item), Cursed Bone, Potion of Wisdom |
| Bloodon (613 / 8010) | 52 | 15,211 | Meat of the Blood Don, Elemental Scroll (Middle Class Item), Potion of Wisdom |
| Antares (956) | 50 | 23,010 | Scorpion Scythe |
| Dragon Knight (8000) | 50 | 3,846 | Upgrade Scroll (Middle Class Item), Cursed Bone, Potion of Sagacity |
Between level 40 and 49 there are 19 different mob names: Sheriff, Stinger, Death Knight, Mastodon, Megantereon, Smilodon, Skeleton Champion, Scolar and others. Below level 30 it's the Kecoon, Bulcan, Gavolt, Zombie and Bandicoot lines.
Refined gemstone
Refined gemstone is a group drop on 7 entries, and they run higher than the other four items: Balrog 8846 and Booro 8847 (level 83, main drop Blessed Immune Scroll), Muspell 9535 (75), Ahtal 9534 and Von Eblis 9538 (70), Amy 9536 (65) and Kapikulu Royal Guard 9522 (50). Balrog 8846's group list also has Advanced leather, Advanced chain, Advanced clothe, Advanced plate, Decoration jewel, Connected iron, Semiprecious stone and Exceptional (+1) weapons.
Crystal and Opal in the exchange box
The Golden Star / Red Bow / Tinsel Ornament box lists Crystal and Opal at 0.439% each; that box's percentages don't add up to 100%, so read them as relative odds. Low Quality Gem, Styx and Refined gemstone aren't in any exchange box. Similar names like Crystal Earring, Crystal Necklace, Opal Ring or the Crystal (+1) armor pieces are different items, and Black, Blue, Green, Red and Yellow Gem are separate exchange boxes.
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