Enhancement Calculator & Odds

Engraving enhancement success (+1 to +20, same for every slot and rarity)

Enhancement cost (unofficial)

⚠️ Unofficial: Nexon is required to publish probabilities, not costs. This table was once flagged for its provenance; on 2026-10-02 it was checked against the Taiwan client. The +15 row (per attempt 1,207 rune shards + 386,145 gold + 5 Enhancement Reignition Catalysts) matches two Taiwanese players' ★6 legendary weapon enhancement screens exactly, and the +1 to +10 costs on the upgrades page are exactly twice a Taiwanese player's measured ★6 armour costs. So these are ★6 legendary WEAPON costs: armour is about half, and ★4 (elite) about a further 2.25× less. +11 to +14 and +16 to +20 have not yet been checked row by row against a Taiwan screen.

• +1 to +4 always succeed; from +5 the rate falls each stage (80%, 70% … 30% at +10), 15% at +11, and only 1% from +16 to +20. Full figures in the table above — all Taiwan's official published values.
• Each failure banks enhancement points (+39.2% per failure at +5, shrinking with each stage, +0.5% from +16); at 100% the next attempt succeeds with certainty and consumes no materials, and any overflow carries to the next stage. From +10 an Enhancement Reignition Catalyst rolls the same attempt twice: either roll succeeding advances one stage, and two successes bank extra points.
• Failure never destroys or downgrades gear. Curses come from rune engraving / performance injection ('at a certain rate') and from failed high-stage enhancement (community says from +4 or +5 — sources disagree); the penalty is a per-slot % stat reduction (undisclosed). Removal: curse-removal potion, blacksmith service, or any successful engraving enhancement clears it automatically.
• Epic and legendary runes share the same success rates; legendary costs ~1.5× more materials.

Rune upgrade success (combine 3 same-grade)

• A successful rune upgrade gets a second check for a chain upgrade (skipping ahead; rates in the table above). With an Alchemy Reignition Catalyst, 10% of successes are Great Successes (one extra rune, rolled at the same odds) and a failure is retried once for free. The chain-upgrade rate is not affected by the catalyst.
• Some upgrade recipes give Unknown Rune Fragments on failure, doubled if the catalyst retry also fails (Taiwan's official alchemy guide). Korean rule: 100 fragments make one random legendary rune you do not own yet (★8 in Korea now; Taiwan's Season 0 legendary is ★6).
• Every upgrade attempt also rolls a separate Rune Upgrade Bonus: independent of success or failure and of the catalyst, it awards one extra rune at a published rate (Taiwan's official odds page).

Option reroll odds (engraving reset)

Enchants (cannot fail)

• Enchanting never fails in this game — applying a scroll replaces the previous effect; the RNG is in the bonus effects.
• 0/1/2 extra effects roll at uniform odds (~1/3 each); which effect (20 kinds) is also uniform, and the same one can appear twice (crit +22 twice, for example). The extras are decided when the scroll drops and printed on it — they are not rolled when you apply it.
• Taiwan's values are fixed: STR / DEX / INT / LUK / WILL +17, every other combat stat +22, bonus HP +67 (the 9/9 update log and the in-game 'extra effect info' screen). The 12–17 / 17–22 / 62–67 ranges in an older official guide are Korea's launch ranges, not used on Taiwan.

Fashion & pet gacha

• Fashion legendary synthesis (epic→legendary): 20%.
• Pity exists only on premium and collab pet boxes: one Pet Lucky Basket at 50, 100 and 150 opens (9 elite pets, 11.11% each), and one epic-pet basket every 200 opens (the 9/9 box gives a Pet Companion Basket — contents per the in-game item info; the MapleStory collab box gives a basket where you pick one of its two collab epics). The count resets when the box rotates. The regular pet box has no pity. Legendary pets are in no box — only epic-pet ascension (20%) makes one.