Do the math before you enhance: expected cost, rune-upgrade expectations, and gacha probability calculators — full official rate tables below.
📊 KR-server data: community transcriptions of the official in-game disclosures. For TW-official numbers, check the in-game probability viewer.
Enhancement cost calculator
Why start at +10? The +1–+10 rates are shown only inside the game and have never been published (KR community: ≈100% success, negligible cost). To keep the expected-cost math honest, the calculator covers only the disclosed +11–+20 range.
Expected attempts
33
Expected gold
6,357,206
Expected rune shards
19,867
Expected catalysts
164.9
Worst case (pity every stage): 9,848,335 gold / 30,778 shards.
Rune upgrade expectation calculator
Avg. source runes needed
23,822.6
★0 Advanced
Avg. combine attempts
11,910.8
Assumes: on failure the slot-1 rune survives and 2 are lost; the 10% Great Success and catalyst retries are not counted (real cost is slightly lower).
Gacha probability calculator
%
Expected pulls
50 pulls
50% chance of ≥1
35 pulls
90% chance of ≥1
114 pulls
99% chance of ≥1
228 pulls
Pet boxes also have a hard pity at 200 pulls; expectations are statistical averages.
Engraving enhancement success (+11 to +20, weapon)
Stage
Success
Rune shards/try
Catalyst/try
Gold/try
Pity tries
+11
15%
344
5
110,013
7
+12
10%
361
5
115,513
10
+13
7%
560
5
179,321
14
+14
5%
846
5
270,631
20
+15
3%
1,207
5
386,145
33
+16
1%
1,375
9
440,051
100
+17
1%
2,407
9
770,889
100
+18
1%
3,094
9
990,115
100
+19
1%
4,125
9
1,320,153
100
+20
1%
8,251
9
2,640,305
100
Stages +1 to +10 are near-100% success (exact values are in-game only).
Each attempt builds enhancement points; at 100% the next attempt is guaranteed (pity), then resets. From +15 a catalyst adds +1% per attempt.
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)
Materials
Result
Success
★0 Advanced
★1 Advanced
90%
★1 Advanced
★2 Rare
85%
★2 Rare
★3 Rare
80%
★3 Rare
★4 Elite
50%
★4 Elite
★5 Epic
40%
★5 Epic
★6 Legendary
10%
On success, 10% chance of a Great Success (double output); a catalyst grants one retry on failure.
Pity: failed ★8 upgrades/dismantles grant Unknown Rune Fragments — 100 of them guarantee a random unowned ★8 legendary.
The Goro quest chain grants one guaranteed legendary; S2 added a legendary pity (retroactive).
Option reroll odds (engraving reset)
Options
Each
Weapon / accessory (11 options)
11
9.09%
Armor / emblem · line 1 defense (3 options)
3
33.33%
Armor / emblem · line 2 offense (11 options)
11
9.09%
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 bonus effects roll at uniform odds (~1/3 each); effect type (20 kinds) and value are uniform random.
Value ranges: STR/DEX/INT/LUK/WILL 12–17; most combat lines (crit, bonus hit, ultimate, break, skill power) 17–22; bonus HP 62–67.
Pet box pity: guaranteed at 200 pulls; legendary pets come only from combining.
Sources: Arca.live / DC Inside transcriptions of official disclosures (Jun 2025), detailedmanual, Namuwiki — see the research ledger. Undisclosed items (+1–+10 exact rates, curse odds, dungeon drop rates) are deliberately omitted.