Xavier: King of Darknight

Rarity	★★★★★
Role	DPS \| Burst \| Single-target
Scaling	HP
Best For	Single Target
Specialty	HP-Scaling DPS
Unlock Method	Limited Event Banner
Solar Pair

Skills and Weapons

His Skills

	Royal Seal Support SkillCooldown 15s Xavier pierces enemies with his sword, dealing damage and granting you 1 stack of Last Words. When you enter or exit Darknight Reign, this skill's cooldown ends in 5s. Empowered version cannot be triggered during Darknight Reign.
	Lumenflora Grace Resonance SkillCooldown 15sCost 2 ◆ Xavier leaps into the air with you, gathering enemies, then strikes down blooming a sea of Lumenflora. Only this skill can destroy enemy shields. On full Stellactrum Match, it destroys 2 shield layers.
	Royal Decree Ardent Oath Xavier thrusts his sword into the Sinders, summoning a sea of Lumenflora. You bless him as he wields a giant sword to strike enemies. Usually you can use it once during a battle, use Oath Recovery Boost protocore to utilize it twice.
	Coronation Passive Skill Upon entering battle, you gain an additional skill Darknight Coronation. After casting it, you and Xavier enter the Darknight Reign state for 9s (30s cooldown).

My skills

5★ companions' MC has her own special weapon. You can always switch to standard weapons but you can’t wield other companion's exclusive weapons.

Final Resound

King of Darknight's exclusive weapon

	Prayer Basic Attack A 4‑hit combo. Charged Attack shoots a ray of radiant light.
	Procession Passive Skill Hitting an enemy with Active Skill for the first time recovers 0.45 Energy Charge. During Darknight Reign, damage dealt and DMG Boost to Weakened are increased by 8%.
	Final Elegy Active SkillCooldown 12sCost 1 ◆ Wields Final Resound to sing an elegy, dealing AoE damage. Within 2.7s of casting, if you have at least 1 stack of Last Words, you may cast again with enhanced damage.

Standard Weapons

Gameplay

King of Darknight is a controlled, methodical companion who cycles between two phases:

Outside Darknight Reign: Build Last Words stacks → consume them with Final Elegy (Active Skill) to gain Lumenflora Stamen and reduce Reign cooldown.

Buffs that are displayed outside the Burst — Buffs outside Darknight Reign

Inside Darknight Reign: Spend your Stamens to reduce initial cooldown of your special Active Skill The Chosen One's Blessing, then spam it and the empowered Support Skill Royal Seal for burst damage.

Outside Darknight Reign | The Setup Phase

Accumulate Last Words: wait for passive generation OR use Royal Seal (Support Skill) to get 1 stack instantly.
Cast Final Elegy (Active Skill): consumes 1 Last Words → reduces Darknight Coronation cooldown by 4s → gives 1 Lumenflora Stamen.
Within 2.7s, cast Final Elegy again (enhanced version) it consumes another Last Words → another stack.
Repeat until you have 3 Stamens and Darknight Coronation is ready.

Outside Burst rotation example — Before entering Burst try to get all three flower buffs first

Entering Darknight Reign

Best timing: When the enemy's shield is broken or nearly broken. Press the Darknight Coronation button.

Duration: 9 seconds

Cooldown after use: 30s (reduced by consuming Last Words)

Upon entering Reign:

Your Active Skill becomes The Chosen One's Blessing
Royal Seal becomes empowered (cannot trigger the normal empowered version, but blooms extra Lumenflora)
Each Lumenflora Stamen you have reduces the initial cooldown of The Chosen One's Blessing by 3.4s (up to 10.2s with 3 stacks)

Inside Darknight Reign | The Burst Phase

Goal: Spam The Chosen One's Blessing and Royal Seal as many times as possible within 9 seconds.

The Chosen One's Blessing ⇨ Royal Seal ⇨ The Chosen One's Blessing ⇨ Royal Seal ⇨ repeat

The Chosen One's Blessing creates Radiant Ripples under you (AoE damage). Can be cast up to 3 times per Reign.
Royal Seal blooms additional Lumenflora, dealing big AoE damage.

At R1+: During Reign, you become unstoppable and Radiant Ripples damage increases by 40%. The Support Skill cooldown resets when you create Ripples.

At R3: Xavier also creates Radiant Ripples when you do, and each Ripple undulation increases Lumenflora damage by 6% (up to 36%) during Reign.

Burst rotation example — When entering the Burst try to spam Active Skill and his Support Skill as much as possible

Complete Rotation

OUTSIDE REIGN: Build Last Words (wait or use Royal Seal) ⇨ Final Elegy (consumes 1) ⇨ Enhanced Final Elegy (consumes another) ⇨ repeat until 3 Stamens and Darknight Coronation ready
WAIT for enemy shield to break (or almost break)
PRESS Darknight Coronation ⇨ ENTER REIGN (9 seconds)
INSIDE REIGN: The Chosen One's Blessing ⇨ Royal Seal ⇨ repeat up to 3 times ⇨ Use Royal Decree (Ardent Oath) if available
REIGN ENDS ⇨ Return to OUTSIDE (cooldown 30s, reduced by your setup)
REPEAT ↺