diff --git a/server/charactor/pyro/__init__.py b/server/charactor/pyro/__init__.py
index ac55ae98..c3994cd7 100644
--- a/server/charactor/pyro/__init__.py
+++ b/server/charactor/pyro/__init__.py
@@ -5,13 +5,15 @@
 from .xiangling import Xiangling, Guoba, Crossfire
 from .yanfei import Yanfei, RightOfFinalInterpretation
 from .hu_tao import HuTao, SanguineRouge
+from .diluc import Diluc, FlowingFlame
 
 
 PyroCharactors = (
     FatuiPyroAgent | Klee | Bennett | Yoimiya | Xiangling | Yanfei | HuTao
+    | Diluc
 )
 SummonsOfPyroCharactors = Guoba | Guoba
 PyroCharactorTalents = (
     PaidinFull | PoundingSurprise | GrandExpectation | NaganoharaMeteorSwarm
-    | Crossfire | RightOfFinalInterpretation | SanguineRouge
+    | Crossfire | RightOfFinalInterpretation | SanguineRouge | FlowingFlame
 )
diff --git a/server/charactor/pyro/diluc.py b/server/charactor/pyro/diluc.py
new file mode 100644
index 00000000..576aed6f
--- /dev/null
+++ b/server/charactor/pyro/diluc.py
@@ -0,0 +1,144 @@
+from typing import Any, List, Literal
+
+from ...modifiable_values import CostValue
+from ...event import RoundPrepareEventArguments
+
+from ...action import Actions
+from ...struct import Cost
+
+from ...consts import (
+    DamageElementalType, DieColor, ElementType, FactionType, 
+    WeaponType
+)
+from ..charactor_base import (
+    ElementalBurstBase, ElementalSkillBase, 
+    PhysicalNormalAttackBase, CharactorBase, SkillTalent
+)
+# Skills
+
+
+class SearingOnslaught(ElementalSkillBase):
+    name: Literal['Searing Onslaught'] = 'Searing Onslaught'
+    desc: str = (
+        'Deals 3 Pyro DMG. For the third use of this Skill each Round, deals '
+        '+2 DMG.'
+    )
+    damage_type: DamageElementalType = DamageElementalType.PYRO
+    cost: Cost = Cost(
+        elemental_dice_color = DieColor.PYRO,
+        elemental_dice_number = 3
+    )
+
+    counter: int = 0
+
+    def event_handler_ROUND_PREPARE(
+        self, event: RoundPrepareEventArguments, match: Any
+    ) -> List[Actions]:
+        """
+        When in round prepare, reset counter
+        """
+        self.counter = 0
+        return []
+
+    def value_modifier_COST(
+        self, value: CostValue, match: Any, mode: Literal['REAL', 'TEST']
+    ) -> CostValue:
+        """
+        If self equipped talent, reduce the second use cost by 1
+        """
+        if self.counter != 1:
+            # not second use
+            return value
+        if not self.is_talent_equipped(match):
+            # no talent
+            return value
+        if not self.position.check_position_valid(
+            value.position, match, player_idx_same = True, 
+            charactor_idx_same = True, area_same = True, id_same = True
+        ):
+            # not this skill
+            return value
+        # decrease cost
+        value.cost.decrease_cost(DieColor.PYRO)
+        return value
+
+    def get_actions(self, match: Any) -> List[Actions]:
+        """
+        if it is the third time to use, increase damage by 2
+        """
+        self.counter += 1
+        if self.counter == 3:
+            self.damage = 5
+        ret = super().get_actions(match)
+        self.damage = 3
+        return ret
+
+
+class Dawn(ElementalBurstBase):
+    name: Literal['Dawn'] = 'Dawn'
+    desc: str = '''Deals 8 Pyro DMG. This character gains Pyro Infusion.'''
+    damage: int = 8
+    damage_type: DamageElementalType = DamageElementalType.PYRO
+    cost: Cost = Cost(
+        elemental_dice_color = DieColor.PYRO,
+        elemental_dice_number = 4,
+        charge = 3
+    )
+
+    def get_actions(self, match: Any) -> List[Actions]:
+        return super().get_actions(match) + [
+            self.create_charactor_status(
+                'Pyro Elemental Infusion',
+                { 'mark': 'Diluc' }
+            )
+        ]
+
+
+# Talents
+
+
+class FlowingFlame(SkillTalent):
+    name: Literal['Flowing Flame']
+    desc: str = (
+        'Combat Action: When your active character is Diluc, equip this card. '
+        'After Diluc equips this card, immediately use Searing Onslaught '
+        'once. When your Diluc, who has this card equipped, uses Searing '
+        'Onslaught for the second time in one Round, spend 1 less Pyro Die.'
+    )
+    version: Literal['3.3'] = '3.3'
+    charactor_name: Literal['Diluc'] = 'Diluc'
+    cost: Cost = Cost(
+        elemental_dice_color = DieColor.PYRO,
+        elemental_dice_number = 3,
+    )
+    skill: SearingOnslaught = SearingOnslaught()
+
+
+# charactor base
+
+
+class Diluc(CharactorBase):
+    name: Literal['Diluc']  # Do not set default value for charactor name
+    version: Literal['3.3'] = '3.3'
+    desc: str = '''"Dark Side of Dawn" Diluc'''
+    element: ElementType = ElementType.PYRO
+    max_hp: int = 10
+    max_charge: int = 3
+    skills: List[
+        PhysicalNormalAttackBase | SearingOnslaught | Dawn
+    ] = []
+    faction: List[FactionType] = [
+        FactionType.MONDSTADT
+    ]
+    weapon_type: WeaponType = WeaponType.CLAYMORE
+    talent: FlowingFlame | None = None
+
+    def _init_skills(self) -> None:
+        self.skills = [
+            PhysicalNormalAttackBase(
+                name = 'Tempered Sword',
+                cost = PhysicalNormalAttackBase.get_cost(self.element),
+            ),
+            SearingOnslaught(),
+            Dawn()
+        ]
diff --git a/server/status/charactor_status/pyro_charactors.py b/server/status/charactor_status/pyro_charactors.py
index b6b841a7..0cdda5ba 100644
--- a/server/status/charactor_status/pyro_charactors.py
+++ b/server/status/charactor_status/pyro_charactors.py
@@ -400,7 +400,16 @@ def event_handler_ROUND_END(
         )]
 
 
+class DilucInfusion(ElementalInfusionCharactorStatus, 
+                    RoundCharactorStatus):
+    name: Literal['Pyro Elemental Infusion'] = 'Pyro Elemental Infusion'
+    mark: Literal['Diluc'] = 'Diluc'
+    version: Literal['3.3'] = '3.3'
+    usage: int = 2
+    max_usage: int = 2
+
+
 PyroCharactorStatus = (
     Stealth | ExplosiveSpark | NiwabiEnshou | Brilliance | ScarletSeal
-    | ParamitaPapilio | BloodBlossom
+    | ParamitaPapilio | BloodBlossom | DilucInfusion
 )