Overview
Citlali is a Support for primarily Melt, and secondarily Cryo and Hydro DMG. She Shreds the RES of enemies while her companion Itzpapa is on the field and Melt or Vaporize are triggered. She applies Cryo while off-field, having a particular Application profile that is very beneficial for Melt carries.
Cryo Application & Nightsoul's Blessing
Citlali’s Cryo Application is mostly found in her Nightsoul’s Blessing state. While in the Opal Fire state, a sub-state of her Nightsoul’s Blessing, Citlali will deal Cryo hits in a large AoE around the active character, applying Cryo on every second hit (assuming they hit the same enemy). Citlali can gain Nightsoul points through her Elemental Skill, Elemental Burst and through Nightsoul Bursts triggered by her teammates. Citlali will only actually enter her Nightsoul’s Blessing state through her Skill or Burst, though. Citlali will gain 4 Energy through her Ascension 4 passive whenever teammates trigger Nightsoul Bursts. Nightsoul Bursts will trigger passively when a teammate strikes an enemy, with a cooldown of 18/12/9 seconds depending on the amount of Nightsoul characters in the party (1/2/3+).
Elemental Skill & RES Shred
Citlali’s Elemental Skill will deal a little bit of ATK-scaling Cryo DMG around her and generate an EM-scaling Cryo Shield with a 20s duration, as well as summon Itzpapa to move around with the active character for 20 seconds. While Itzpapa is active, Melt Elemental Reactions will reduce the Pyro RES of opponents hit by it by 20%, and Freeze Reactions will reduce the Hydro RES of opponents by 20%. Both effects last 20 seconds. When such a Reaction is triggered, Citlali will gain 16 Nightsoul points. This effect can trigger once every 8 seconds, so on average will trigger 1-2 times per rotation.
On cast, Citlali will gain 24 Nightsoul points. Citlali has a maximum of 100 Nightsoul points, and until she reaches 50 Nightsoul points, she will not begin consuming her Nightsoul. If this Skill hits an enemy, it will generate 5 Cryo Particles. It has a cooldown of 16 seconds.
Opal Fire state
When Citlali reaches 50 Nightsoul points through any means, she will enter the ‘Opal Fire’ state. Itzpapa will begin a field around the active character that deals Cryo DMG once per second. These hits do not deal a lot of damage, though they will deal some EM scaling damage through her Ascension 4 passive. While in the Opal Fire state, Citlali will consume 8 Nightsoul points per second. In an average Melt rotation, Citlali will be in this state long enough to perform 12 or so Cryo hits.
Elemental Burst & Spiritvessel Skull
Citlali’s Elemental Burst has a cooldown of 15 seconds and an Energy cost of 60. It’s typically quite important for Citlali to use this Burst to enter the Opal Fire state for long enough.
When cast, Citlali’s Elemental Burst will deal a bit of ATK-scaling AoE Cryo DMG. This hit will gain additional EM scaling through her Ascension 4 passive. Citlali will also gain 24 Nightsoul points, and summon ‘Spiritvessel Skulls’ to opponents hit by her Burst, up to 3 on 3 different enemies. These will explode after a little bit of time and deal further AoE Cryo DMG. Each Spiritvessel Skull explosion will give Citlali 3 Nightsoul points.
Spiritvessel Skulls do not share Application Cooldown with the rest of Citlali's Cryo Application, simply being an extra Cryo hit.