Cipher 
Nihility In the fallen city of bandits, Dolos, the 300 Rogues run wild and free. Race onward, fleet-footed Thief Star Cifera, Chrysos Heir of the "Trickery" Coreflame. May your web of lies spread with the breeze throughout all lands— "Tryna trick me? Not a chance!"
HP
ATK
DEF
SPEEDSubdps Build
Best Light Cone
Cipher Best Stats
Cipher Best Substats
Debuffer Build
Best Light Cone
Cipher Best Stats
Cipher Best Substats
Cipher Best Teams
Free-to-Play Dual DPS
For a free-to-play team, you can use any DPS with Cipher provided that they benefit from her debuffs. As for other units, Asta is a great F2P Support for Cipher since she can buff her SPD, which Cipher needs.
Acheron Hypercarry
Cipher can do great in an Acheron team as both a Sub-DPS and a speedy debuffer that can help buildup Slashed Dream. With E0 Acheron, you will need another Nihility character to unlock the full damage buff. If Acheron is at E2, you can use a Harmony unit since she only needs one Nihility unit to activate the damage buff fully.
Feixiao Follow-Up Team
As a Follow-Up attacker, Cipher can be an excellent Sub-DPS to Feixiao or Dr. Ratio thanks to her frequent attacks and debuffs. Ideally, you'd want units that can provide debuffs to have the Pioneer Diver of Dead Waters at full uptime.
Archer Skill Point Team
Cipher can also work as a Sub-DPS to Archer. Cipher can simply use her Basic Attacks to generate Skill Points that Archer can use. Sparkle provides Skill Point generation to the party and Permansor Terrae can increase Archer's ATK with his shield.
Skills
Deals Quantum DMG equal to #1[i]% of Cipher's ATK to one designated enemy.
Has a #6[i]% base chance to Weaken one designated enemy and its adjacent targets (decreasing their DMG dealt by #3[i]%) and increases Cipher's ATK by #5[i]%, lasting for #4[i] turn(s). Moreover, deals Quantum DMG equal to #1[i]% of Cipher's ATK to one designated enemy, and Quantum DMG equal to #2[i]% of Cipher's ATK to the adjacent targets.
The base chance of applying debuffs to targets hit. The final probability is affected by the attacker's Effect Hit Rate and enemy targets' Effect RES.
Deals Quantum DMG equal to #1[i]% of Cipher's ATK to one designated enemy. Then, deals True DMG equal to #2[i]% of the current tally kept by Talent to the one designated enemy. Moreover, deals Quantum DMG equal to #4[i]% of Cipher's ATK alongside True DMG equal to #3[i]% of the current tally kept by Talent to the one designated enemy and its adjacent targets. And this True DMG is distributed evenly among all targets of this ability.
Non-Type DMG that is not affected by any effects. This DMG is not considered as using 1 attack.
When there are no enemy targets in the "Patron" state on the battlefield, Cipher immediately causes one enemy target with the highest Max HP on the battlefield to become the "Patron." When using Skill and Ultimate, the primary target becomes the "Patron." The "Patron" state only takes effect on the most recent target. After the "Patron" gets attacked by other ally targets, Cipher immediately launches Follow-Up ATK against the "Patron," dealing Quantum DMG equal to #1[i]% of Cipher's ATK. This effect can trigger up to #3[i] time(s) per turn, and this trigger count resets at the start of Cipher's turn. Cipher will tally #2[i]% of the non-True DMG dealt by ally targets to the "Patron." Overflow DMG will not be tallied. After using Ultimate, clears this tally.
Unleashes an extra attack on the target. This effect is triggered automatically when requirements are met.
Non-Type DMG that is not affected by any effects. This DMG is not considered as using 1 attack.
Gains "Zagreus's Blessing" that lasts for #1[i] second(s). During this time, Cipher will be undetectable by enemies and her movement speed increases by 50%. When approaching an enemy in the overworld/Simulated Universe/Divergent Universe, can immediately gain a random Consumable. Consumables can be gained this way for up to #4[i] time(s) in each Earth day. When entering battle with "Zagreus's Blessing" active, deals Quantum DMG equal to #3[i]% of Cipher's ATK to all enemies. And the tallied amount Cipher gains from this instance of DMG increases by #2[i]%.
Traces
Eidolon
Cipher's tally of DMG is
Unleashes an extra attack on the target. This effect is triggered automatically when requirements are met.
When Cipher hits an enemy target, there is a
The base chance of applying debuffs to targets hit. The final probability is affected by the attacker's Effect Hit Rate and enemy targets' Effect RES.
Ultimate Lv. +2, up to a maximum of Lv.
After the "Patron" gets attacked by an ally target, Cipher deals Quantum Additional DMG to it equal to
Causes the target being hit to take extra DMG, which is not considered an attack.
Skill Lv. +2, up to a maximum of Lv.
The DMG dealt by Follow-Up ATK from Cipher's Talent increases by
Unleashes an extra attack on the target. This effect is triggered automatically when requirements are met.