For people to get an idea of what they should spend on re-rolling lists. It will help to know the actual odds of getting their desired Combat Mastery (CM) points. Now this isn't a 100% accurate because odds are just a range of what most will expect.
A little bit of how this works.
Since we know a stat is maxed out on cm at 25% or 100 used. We will take the amount available as 100-cm used for stat. In other words, all stats without any CM used have 100 of each starting us at 3,800 possible outcomes.
Now I am not doing all the odds from 0 to 100 cm used. I'll start at the last 20. This is 80 CM used on a single stat giving it 20%. To give the best chance will have 1,500 CM used. So just 20 remaining to spend.
Also note that a list can't repeat so the same 6 won't appear next list, but it could the list after. This improves chances slightly for a good stat.
| CM Remaining | Average Rolls | Total % | |
|---|---|---|---|
| 20 | 115 | 20 | |
| 19 | 121 | 20.25 | |
| 18 | 128 | 20.5 | |
| 17 | 136 | 20.75 | |
| 16 | 144 | 21 | |
| 15 | 154 | 21.25 | |
| 14 | 165 | 21.5 | |
| 13 | 178 | 21.75 | |
| 12 | 192 | 22 | |
| 11 | 210 | 22.25 | |
| 10 | 231 | 22.5 | |
| 9 | 257 | 22.75 | |
| 8 | 290 | 23 | |
| 7 | 330 | 23.25 | |
| 6 | 385 | 23.5 | |
| 5 | 463 | 23.75 | |
| 4 | 579 | 24 | |
| 3 | 773 | 24.25 | |
| 2 | 1160 | 24.5 | |
| 1 | 2319 | 24.75 | |
| 0 | 0 | 25 |
As a way to ease the cost if you have 6 idea stats in mind you can divide the odds above by 6 for the chance you will see at least one of them.
For a rough guideline of what you will need to spend.
From personal experience you can get from 22.5% to 25% on 10 stats with around 600 diamonds.
So its likely you can spend up to 2k to get your cms at perfect or close anyway.