Guide
How the kit works
Set up your teammates’ effects, then use Ancient Rite: Arcane Light to enter Manifest Flame. Flins gains interruption resistance, and his Normal and Charged Attacks deal Electro DMG that other infusions cannot override. He cannot perform Plunging Attacks in this form.
Use Normal and Charged Attacks from Pocztowy Demonspear (NA), then use the replacement Skill, Northland Spearstorm (E), for AoE Electro DMG. Its base cooldown is 6 seconds and cannot be changed by other effects. For 6 seconds after using it, Flins’s Burst becomes Thunderous Symphony (Q), which costs less Energy and deals one instance of AoE Electro DMG considered Lunar-Charged DMG.
Without that replacement, Ancient Ritual: Cometh the Night deals AoE Electro DMG, followed after a delay by two middle-phase hits and one final-phase hit considered Lunar-Charged DMG. At Moonsign: Ascendant Gleam, nearby thunderclouds add two middle-phase hits to the regular Burst or one Lunar-Charged hit to Thunderous Symphony.
Symphony of Winter gives Flins’s own Lunar-Charged reactions 20% more damage at Ascendant Gleam. Whispering Flame converts 8% of his ATK into Elemental Mastery, up to 160. Old World Secrets also increases Lunar-Charged Base DMG by 0.7% per 100 ATK, up to 14%.
Build and why
Use four pieces of Night of the Sky's Unveiling. Its two-piece bonus gives 80 Elemental Mastery. When a nearby party member triggers a Lunar Reaction while Flins is on field, the four-piece effect gives him 15% CRIT Rate at Nascent Gleam or 30% at Ascendant Gleam for 4 seconds. It also contributes a Gleaming Moon effect for the party’s Lunar Reaction DMG bonus.
Marechaussee Hunter is an alternative if Flins’s HP increases or decreases during combat: its four-piece effect grants CRIT Rate when that happens. Gilded Dreams is another option, giving ATK for teammates of the same element and Elemental Mastery for teammates of different elements after Flins triggers a reaction.
For sands and goblet, choose ATK Percentage or Elemental Mastery. For the circlet, choose CRIT DMG or CRIT Rate. The build’s substat order is CRIT DMG, CRIT Rate, ATK Percentage, then Elemental Mastery. Account for the set’s CRIT Rate when balancing the circlet and substats.
Bloodsoaked Ruins is the first weapon to consider: after a Burst it increases Lunar-Charged DMG, and triggering the reaction grants CRIT DMG and restores Energy. Staff of the Scarlet Sands turns Elemental Mastery into bonus ATK, with further bonuses when the Skill hits. Fractured Halo gives ATK after a Skill or Burst; its party Lunar-Charged bonus requires the wielder to create a Shield.
Leveling priority
A suggested talent order is Ancient Ritual: Cometh the Night, Ancient Rite: Arcane Light, then Pocztowy Demonspear (NA). The Burst comes first here because both its regular and replacement versions deal Lunar-Charged damage. The Skill and attacks are part of his field time, but his form cannot use the Plunging Attack portion of the basic talent.
For full ascension, collect 420,000 Mora, 168 Frostlamp Flower, 1 Vajrada Amethyst Sliver, 9 Vajrada Amethyst Fragment, 9 Vajrada Amethyst Chunk, 6 Vajrada Amethyst Gemstone, 18 Broken Drive Shaft, 30 Reinforced Drive Shaft, 36 Precision Drive Shaft and 46 Precision Kuuvahki Stamping Die.
Maxing all talents takes 4,957,500 Mora, 3 Crown of Insight, 9 Teachings of Vagrancy, 63 Guide to Vagrancy, 114 Philosophies of Vagrancy, 18 Broken Drive Shaft, 66 Reinforced Drive Shaft, 93 Precision Drive Shaft and 18 Ascended Sample: Queen.
Constellations worth it
The Devil's Wall is a strong upgrade to consider. For 6 seconds after Northland Spearstorm (E), the next Normal Attack hit adds AoE Electro DMG equal to 50% of ATK, considered Lunar-Charged DMG. At Ascendant Gleam, Flins’s Electro hits also reduce the target’s Electro RES by 25% for 7 seconds while he is on field.
Songs and Dances of Death elevates damage from Flins’s Lunar-Charged reactions by 35%. At Ascendant Gleam, it also elevates nearby party members’ Lunar-Charged DMG by 10%. Part the Veil of Snow is useful earlier: it reduces Northland Spearstorm’s base cooldown to 4 seconds and restores 8 Energy when party members trigger Lunar-Charged, once every 5.5 seconds.
Stranger in the Night adds three Burst levels, while Exile's Shadow adds three Skill levels. Night on Bald Mountain gives 20% ATK and improves Whispering Flame to 10% of ATK as Elemental Mastery, with a 220 cap. These are reasonable places to stop short if you do not need their particular bonuses.
Common mistakes
Do not expect a Plunging Attack in Manifest Flame or try to override its Electro infusion. Use the attacks available in the form instead.
Do not wait too long after Northland Spearstorm if you want the cheaper Burst: Thunderous Symphony replaces the regular Burst for only 6 seconds. Also, do not assume Ascendant Gleam alone gives its extra hits; nearby thunderclouds are required.
Do not build only Elemental Mastery and ignore ATK or CRIT stats. Flins’s passives also reward ATK, and Night of the Sky's Unveiling already supplies CRIT Rate under its conditions. Check those bonuses before choosing your circlet.
