How high can a BUS take a high class item?
Every try costs coins and the price climbs: 240,000 per try from +4 to +6, 750,000 for the next step and 1,000,000 coins for the last open step. Trina's Piece matters most where the base chance is low.
| Step | BUS | BUS + Trina's Piece | Coins |
|---|---|---|---|
| +1 → +2 | 100% | 100% | 25,000 |
| +2 → +3 | 100% | 100% | 35,000 |
| +3 → +4 | 70% | 100% | 75,000 |
| +4 → +5 | 40% | 50% | 240,000 |
| +5 → +6 | 20% | 30% | 240,000 |
| +6 → +7 | 3% | 5% | 750,000 |
| +7 → +8 | 1% | 2% | 1,000,000 |
| +8 → +9 | Closed | Closed | — |
On OldSchoolKO a BUS has a 1% chance from +7 to +8, or 2% with Trina's Piece. REB reverse steps are 20% each, 40% with Shadow Piece; +9 on normal items and reverse +6 are closed.
REB reverse upgrade rates
Source / rights
With a Reverse Item Strengthen Scroll (REB) every step from reverse +1 to +5 has the same chance and costs 240,000 coins. Shadow Piece doubles the chance; reverse +5 to +6 is closed.
| Step | REB | REB + Shadow Piece | Coins |
|---|---|---|---|
| Reverse +1 → +2 | 20% | 40% | 240,000 |
| Reverse +2 → +3 | 20% | 40% | 240,000 |
| Reverse +3 → +4 | 20% | 40% | 240,000 |
| Reverse +4 → +5 | 20% | 40% | 240,000 |
| Reverse +5 → +6 | Closed | Closed | — |
Middle class and low class item rates
These items use an Upgrade Scroll, and Trina's Piece has middle class and low class versions. A middle class item has a 5% chance from +7 to +8 with Trina, while the low class table stops at +7.
| Step | Upgrade Scroll | + Trina's Piece (Middle Class) | Coins |
|---|---|---|---|
| +1 → +2 | 100% | 100% | 12,500 |
| +2 → +3 | 100% | 100% | 25,000 |
| +3 → +4 | 70% | 100% | 35,000 |
| +4 → +5 | 40% | 60% | 50,000 |
| +5 → +6 | 20% | 30% | 100,000 |
| +6 → +7 | 7% | 12% | 210,000 |
| +7 → +8 | 3% | 5% | 400,000 |
| +8 → +9 | Closed | Closed | — |
| Step | Upgrade Scroll | + Trina's Piece (Low Class) | Coins |
|---|---|---|---|
| +1 → +2 | 100% | 100% | 5,000 |
| +2 → +3 | 100% | 100% | 10,000 |
| +3 → +4 | 70% | 100% | 20,000 |
| +4 → +5 | 60% | 85% | 35,000 |
| +5 → +6 | 40% | 60% | 75,000 |
| +6 → +7 | 7% | 20% | 100,000 |
How do you take an accessory from +7 to +10?
With an Accessory Compound Scroll every step from +6 to +10 succeeds 100% of the time; the real cost is coins.
| Step | Success | Coins |
|---|---|---|
| +6 → +7 | 100% | 125,000 |
| +7 → +8 | 100% | 10,000,000 |
| +8 → +9 | 100% | 25,000,000 |
| +9 → +10 | 100% | 100,000,000 |
Where do you get Trina's Piece and Shadow Piece?
In the Power Up Store Trina's Piece costs 2,800 KC, the middle class version 2,000 KC, the low class version 1,750 KC and Shadow Piece 3,700 KC.
Trina also drops in game: since 23 June the 200-kill quest and the Darkmare quest give a 48-hour Trina, and the Collection Race (PK) reward pool includes Trina too.
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