Is this the probability it’s supposed to be?

Pls just check my data, I’ve already used 13 Hinekora’s Braids on my solor amulet, and it still hasn’t been sanctified to +4 spell skills. What the hell is going on??? Are you telling me I’m just bad luck???

That is the most unique misspelling of Hinekora I've ever seen.

Amulets don't go to +4 spell skills, only +3.

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Musano#5035 wrote:

Amulets don't go to +4 spell skills, only +3.

They do with sanctification

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karsey#2995 wrote:

That is the most unique misspelling of Hinekora I've ever seen.

XD

Ah now I'm following what you're doing, yup RNG will RNG

20 braids have been used, no +4 spell skills, yikes, as they told me：its ea dipxhit, deal with it

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Musano#5035 wrote:

Ah now I'm following what you're doing, yup RNG will RNG

It's a single digit percent chance of rolling, EA has nothing to do with it, you're hoping to satisfy a specific mod, then you're hoping to roll a positive outcome, and in the case of adding a +1 off a +3 your positive roll has to be near perfect.

Just because you missed the roll the first time does mean your odds increase. Its RNG.

If it's RNG, even 21 sanctifications can't get a +4 to spell skills? That's right, I've used 21 braids so far.

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Musano#5035 wrote:

It's a single digit percent chance of rolling, EA has nothing to do with it, you're hoping to satisfy a specific mod, then you're hoping to roll a positive outcome, and in the case of adding a +1 off a +3 your positive roll has to be near perfect.

Just because you missed the roll the first time does mean your odds increase. Its RNG.

"

Eden#7078 wrote:

Pls just check my data, I’ve already used 13 Hinekora’s Braids on my solor amulet, and it still hasn’t been sanctified to +4 spell skills. What the hell is going on??? Are you telling me I’m just bad luck???

Sanctify tooltip says:
"Sanctifying an item will randomise the numeric values of its modifiers, then multiply the values of those modifiers by a random value ranging from 80% to 120%. The resulting item will now be Sanctified."

This means that sanctifying an amulet with +3 skill levels will reroll the level modifier and then multiply the resulting roll with 0.8-1.2.

Amulet can have 1, 2 or 3 levels at base roll. Lets assume that when using divine orb (or sanctifying) the chances for each result is equal. Meaning that you have 1/3 chance to roll +3 levels.

After the "divine roll" part of sanctifying an item the resulting roll will be multiplied by number between 0.80-1.20. I assumed that the multiplier is with 2 desimals since that how corrupting an item works. This means that we have 41 different multipliers:

1 = 0.80
10 = 0.81-0.90
10 = 0.91-1.00
10 = 1.01-1.10
10 = 1.11-1.20
= total 41 options

Lets assume that reaching skill level 3.5 will round up to +4 levels.
Now to calculate which multipliers result in 3.5 or higher:
3*x >= 3.5
x >= 1.1666667
x >= 1.17

Multipliers: 1.17, 1.18, 1.19 and 1.20 will cause the amulet to roll +4 levels. This means that 4 out of 41 multipliers will cause the +3 roll to go +4 roll.

Final chance = 1/3 * 4/41 = 4/123 = 0.0325203 = 3.252% chance.

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Bonus: I noticed you have used 25 locks already so your chances to get +4 should be:

P(Chance_with_25_locks) = (1 - 0,9674796748^25)*100 = 56.2431 %

Rip!
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Seems like if an amulet rolls 1, 2 or 3 level it is its own suffix meaning that the ranges cannot reroll. This means that as long as you have +3 amulet your chances are 4/41 to get 3.5 or higher and hence get +4 levels.

Final chance = 4/41 = 0.9756097561 = 9.756 %

With your 25 locks:
P(Chance_with_25_locks) = (1 - 0.9024390244^25)*100 = 92.318 %