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Zero Out All Despair!
Hello, This is the Chaos Zero Nightmare Team

In Chaos Zero Nightmare, probabilities are displayed with rounded decimal values.
Therefore, the total probability displayed may be slightly above or below 100%.
※This information was current as of December 24, 2025.

■ Rescue Guide
ㆍ The “Amplified Distress Signal: Sereniel” event is a Combatant Rate-Up Event.
ㆍ All events that are a part of the Combatant Rate-Up Event share and accumulate the same 5★ pity count.
ㆍ Every 10 rescues, you will obtain at least one 4★ or higher unit.
     At that time the drop rate for 4★ units is (100% - the drop rate for ★5 units).
ㆍ The drop rate for individual Combatants/Partners is 1/n the total probability for each grade and rate-up category.
ㆍ When the Combatant Rate-Up Event ends, seasonal Combatants will not be included in the Standard Rescue pool. 
     These seasonal Combatants may be re-released in the future.


■ Drop Rates
[5★ Units]
ㆍ The base probability of getting a 5★ unit is 1%, and the total probability (including pity) of getting a 5★ unit is 2.14343%.
ㆍ For rescues 1st – 57th, the base probabilities apply. Starting with the 58th rescue, the probability of obtaining a 5★ unit increases by 4.5% with each attempt until the 69th. On the 70th rescue, a 5★ unit is guaranteed, and there is a 50% chance for it to be the 5★ rate-up target.
ㆍ If the rate-up target does not appear on the 70th rescue, the base probabilities will be applied again from the 71st to the 127th rescues.
     Starting with the 128th rescue, the probability of obtaining a 5★ unit increases by 4.5% with each attempt until the 139th.
     On the 140th rescue, the 5★ rate-up target unit is guaranteed.
ㆍ Upon obtaining the 5★ rate-up Unit, the rescue count is reset.
ㆍ The probability of obtaining the 5★ rate-up target (including pity) is 1.42895%.
ㆍ The individual probabilities are as follows:

[4★ Units]
ㆍ The base probability of getting a 4★ unit is 6%, and the total probability (including pity) of getting a 4★ unit is 12.98314%.
ㆍ The probability of obtaining a 4★ unit remains unchanged regardless of the rescue count.
ㆍ Every 10 rescues, you are guaranteed to obtain at least one 4★ or higher unit and the 4★ rate-up agent has a 50% of appearing.
ㆍ If the rate-up target does not appear, the next 4★ unit that appears is guaranteed to be the Rate Up target.
ㆍ The total probability (including pity) for the 4★ rate-up target is 8.65542%.
ㆍ The individual probabilities are as follows:

[3★ Units]
ㆍ The base probability of getting a 3★ unit is 93%, and the total probability (including pity) of getting a 3★ unit is 84.87345%.
ㆍ For rescues 1st – 57th, the base probabilities apply.
     Starting with the 58th rescue, the probability of obtaining a 3★ unit decreases by 4.5% with each attempt until the 69th.
ㆍ If the rate-up target does not appear on the 70th rescue, the base probabilities will be applied again from the 71st to the 127th rescues.
     Starting with the 128th rescue, the probability of obtaining a 3★ unit decreases by 4.5% with each attempt until the 139th.
ㆍ The individual probabilities are as follows:

■ Special Guide
[5★ Units]
ㆍ When a duplicate 5★ Combatant is obtained for the 2nd to 7th time, they will be converted into [Memory Code ×1] for the corresponding unit + [Moment of the Radiant Hero ×20].
Starting from the 8th duplicate, they will be converted into [ Spectral Cube X 1 ] + [ Moment of the Radiant Hero X 50 ].

[4★ Units]
ㆍ When a duplicate 4★ Combatant is obtained for the 2nd to 7th time, it will be converted into [Memory Code ×1] for the corresponding unit + [Moment of the Radiant Hero ×4].
      Starting from the 8th duplicate, it will be converted into [Moment of the Radiant Hero ×10].
ㆍ When a duplicate 4★ Partner is obtained, you will receive that Partner along with [Moment of the Radiant Hero ×4].

[3★ Units]
ㆍ When a duplicate 3★ Partner is obtained, you will receive that Partner along with [Moment of the Radiant Traveler ×20].

Thank you.