Guide
How the kit works
Start by throwing Jumpy Dumpty. It bounces three times, dealing AoE Pyro DMG on each bounce, then splits into mines. The mines explode on contact with opponents or after a short time. The skill starts with two charges.
Use Kaboom! (NA) while Klee is on the field. Her Normal Attack has up to three hits, and her Charged Attack deals AoE Pyro DMG after a short cast. Pounding Surprise gives her a 50% chance to gain an Explosive Spark when a Normal Attack or Jumpy Dumpty deals damage. Her next Charged Attack consumes the spark, costs no Stamina and deals 50% more damage.
Use Sparks 'n' Splash to attack nearby opponents repeatedly with AoE Pyro DMG. A Charged Attack CRIT also triggers Sparkling Burst, giving every party member 2 Elemental Energy.
After completing Witch's Homework: Of Leaves That Spark, bring at least one other Hexerei character to activate Hexerei: Secret Rite. Normal Attack, Elemental Skill and Elemental Burst damage can each grant one Boom Badge, lasting 20 seconds independently. With one, two or three badges, Boom-Boom Strike deals 115%, 130% or 150% of its original damage.
Build and why
Use four pieces of A Day Carved From Rising Winds as your first set choice. A hit grants 25% ATK for 6 seconds, and completing Witch's Homework adds 20% CRIT Rate to that effect. Klee can trigger it with her attacks, skill or Burst.
Crimson Witch of Flames is the next choice: it gives Pyro DMG Bonus and improves several Pyro reactions. Using the skill also strengthens its two-piece bonus. Marechaussee Hunter is another option if the team can change Klee's HP, since those changes build its CRIT Rate effect.
On the sands, use ATK Percentage or Elemental Mastery; on the goblet, use Pyro DMG Bonus; on the circlet, use CRIT Rate or CRIT DMG. A suggested substat order is CRIT Rate, CRIT DMG, ATK Percentage, Elemental Mastery and Energy Recharge. CRIT Rate helps Klee trigger her Energy passive, while Elemental Mastery suits a reaction-focused team.
Reliquary of Truth is a top weapon choice: it gives 8% CRIT Rate and 80 Elemental Mastery after using the skill. Its CRIT DMG effect requires the wielder to deal Lunar-Bloom DMG, so do not count on that effect in every team.
Lost Prayer to the Sacred Winds is another choice, building Elemental DMG Bonus while Klee is in battle. The Widsith is a four-star alternative: its random theme grants ATK, Elemental DMG or Elemental Mastery for 10 seconds when she takes the field.
Leveling priority
A good suggested order is Kaboom! (NA) first, Jumpy Dumpty second and Sparks 'n' Splash third. Klee uses her attacks throughout her field time, including the enhanced Charged Attacks, while the skill and Burst add more Pyro damage.
For maximum ascension, you need 420,000 Mora, 168 Philanemo Mushroom, 1 Agnidus Agate Sliver, 9 Agnidus Agate Fragment, 9 Agnidus Agate Chunk, 6 Agnidus Agate Gemstone, 18 Divining Scroll, 30 Sealed Scroll, 36 Forbidden Curse Scroll and 46 Everflame Seed.
To raise all three skills to their maximum levels, you need another 4,957,500 Mora, 9 Teachings of Freedom, 63 Guide to Freedom, 114 Philosophies of Freedom, 3 Crown of Insight, 18 Divining Scroll, 66 Sealed Scroll, 93 Forbidden Curse Scroll and 18 Ring of Boreas.
Constellations worth it
Chained Reactions and Explosive Frags are the standout upgrades. C1 gives attacks and skills a chance to summon sparks that deal damage equal to 120% of Sparks 'n' Splash damage. C2 makes mines from Jumpy Dumpty reduce the DEF of opponents they hit by 23% for 10 seconds.
Sparkly Explosion is an option if you want an explosion when Klee leaves the field during her Burst. Blazing Delight adds Energy for the other party members during the Burst and grants the party 10% Pyro DMG Bonus for 25 seconds when it is used.
Klee can use her core attack and spark mechanics without constellations. The later upgrades are optional if you are content with that kit; C4's explosion requires you to switch her out while the Burst is active.
Common mistakes
Do not spend all your Stamina on ordinary Charged Attacks without watching for Explosive Spark. A spark makes the next one free and stronger, so use Normal Attacks or the skill to try to gain one.
Do not assume the Hexerei effect is active just because Klee is in the party. Complete her Witch's Homework and bring at least one other Hexerei character first. Build all three badge types if you want the largest listed bonus to Boom-Boom Strike.
Check the conditions on your gear. Marechaussee Hunter needs HP changes for its four-piece CRIT Rate effect, and Reliquary of Truth needs the wielder to deal Lunar-Bloom DMG for its CRIT DMG effect.
