diff --git a/internal/weapons/spear/crimsonmoonssemblance/config.yml b/internal/weapons/spear/crimsonmoonssemblance/config.yml
new file mode 100644
index 0000000000..19d130f91d
--- /dev/null
+++ b/internal/weapons/spear/crimsonmoonssemblance/config.yml
@@ -0,0 +1,3 @@
+package_name: crimsonmoonssemblance
+genshin_id: 13512
+key: crimsonmoonssemblance
diff --git a/internal/weapons/spear/crimsonmoonssemblance/crimsonmoonssemblance.go b/internal/weapons/spear/crimsonmoonssemblance/crimsonmoonssemblance.go
new file mode 100644
index 0000000000..7ba8d2deb0
--- /dev/null
+++ b/internal/weapons/spear/crimsonmoonssemblance/crimsonmoonssemblance.go
@@ -0,0 +1,88 @@
+package crimsonmoonssemblance
+
+import (
+	"fmt"
+
+	"github.com/genshinsim/gcsim/pkg/core"
+	"github.com/genshinsim/gcsim/pkg/core/attacks"
+	"github.com/genshinsim/gcsim/pkg/core/attributes"
+	"github.com/genshinsim/gcsim/pkg/core/combat"
+	"github.com/genshinsim/gcsim/pkg/core/event"
+	"github.com/genshinsim/gcsim/pkg/core/info"
+	"github.com/genshinsim/gcsim/pkg/core/keys"
+	"github.com/genshinsim/gcsim/pkg/core/player/character"
+	"github.com/genshinsim/gcsim/pkg/modifier"
+)
+
+const (
+	icdKey      = "crimsonmoonssemblance-icd"
+	icdDuration = 14 * 60
+)
+
+func init() {
+	core.RegisterWeaponFunc(keys.CrimsonMoonsSemblance, NewWeapon)
+}
+
+type Weapon struct {
+	Index  int
+	core   *core.Core
+	char   *character.CharWrapper
+	refine int
+}
+
+func (w *Weapon) SetIndex(idx int) { w.Index = idx }
+func (w *Weapon) Init() error      { return nil }
+
+func NewWeapon(c *core.Core, char *character.CharWrapper, p info.WeaponProfile) (info.Weapon, error) {
+	w := &Weapon{
+		char:   char,
+		core:   c,
+		refine: p.Refine,
+	}
+
+	c.Events.Subscribe(event.OnEnemyHit, func(args ...interface{}) bool {
+		ae := args[1].(*combat.AttackEvent)
+
+		if ae.Info.AttackTag != attacks.AttackTagExtra {
+			return false
+		}
+
+		if w.core.Player.Active() != w.char.Index {
+			return false
+		}
+
+		if w.char.StatusIsActive(icdKey) {
+			return false
+		}
+
+		w.char.AddStatus(icdKey, icdDuration, true)
+		w.char.ModifyHPDebtByRatio(0.25)
+
+		return false
+	}, fmt.Sprintf("crimsonmoonssemblance-hit-%v", char.Base.Key.String()))
+
+	c.Events.Subscribe(event.OnHPDebt, func(args ...interface{}) bool {
+		maxhp := w.char.MaxHP()
+		m := make([]float64, attributes.EndStatType)
+
+		if w.char.CurrentHPDebt() > 0 {
+			m[attributes.DmgP] += 0.08 + 0.04*float64(w.refine)
+		}
+
+		if w.char.CurrentHPDebt() >= 0.3*maxhp {
+			m[attributes.DmgP] += 0.16 + 0.08*float64(w.refine)
+		}
+
+		w.char.AddStatMod(character.StatMod{
+			Base:         modifier.NewBaseWithHitlag("crimsonmoonssemblance-bonus", -1),
+			AffectedStat: attributes.DmgP,
+			Amount: func() ([]float64, bool) {
+				return m, true
+			},
+		})
+
+		return false
+	}, fmt.Sprintf("crimsonmoonssemblance-hp-debt-%v", char.Base.Key.String()))
+
+	return w, nil
+}
diff --git a/internal/weapons/spear/crimsonmoonssemblance/crimsonmoonssemblance_gen.go b/internal/weapons/spear/crimsonmoonssemblance/crimsonmoonssemblance_gen.go
new file mode 100644
index 0000000000..6d4b32110e
--- /dev/null
+++ b/internal/weapons/spear/crimsonmoonssemblance/crimsonmoonssemblance_gen.go
@@ -0,0 +1,25 @@
+// Code generated by "pipeline"; DO NOT EDIT.
+package crimsonmoonssemblance
+
+import (
+	_ "embed"
+
+	"github.com/genshinsim/gcsim/pkg/model"
+	"google.golang.org/protobuf/encoding/prototext"
+)
+
+//go:embed data_gen.textproto
+var pbData []byte
+var base *model.WeaponData
+
+func init() {
+	base = &model.WeaponData{}
+	err := prototext.Unmarshal(pbData, base)
+	if err != nil {
+		panic(err)
+	}
+}
+
+func (x *Weapon) Data() *model.WeaponData {
+	return base
+}
diff --git a/internal/weapons/spear/crimsonmoonssemblance/data_gen.textproto b/internal/weapons/spear/crimsonmoonssemblance/data_gen.textproto
new file mode 100644
index 0000000000..a30c8aaab3
--- /dev/null
+++ b/internal/weapons/spear/crimsonmoonssemblance/data_gen.textproto
@@ -0,0 +1,63 @@
+id: 13512
+key: "crimsonmoonssemblance"
+rarity: 5
+weapon_class: WEAPON_POLE
+image_name: "UI_EquipIcon_Pole_BloodMoon"
+base_stats: {
+   base_props: {
+      prop_type: FIGHT_PROP_BASE_ATTACK
+      initial_value: 47.537
+      curve: GROW_CURVE_ATTACK_302
+   }
+   base_props: {
+      prop_type: FIGHT_PROP_CRITICAL
+      initial_value: 0.048
+      curve: GROW_CURVE_CRITICAL_301
+   }
+   promo_data: {
+      max_level: 20
+   }
+   promo_data: {
+      max_level: 40
+      add_props: {
+         prop_type: FIGHT_PROP_BASE_ATTACK
+         value: 31.1
+      }
+   }
+   promo_data: {
+      max_level: 50
+      add_props: {
+         prop_type: FIGHT_PROP_BASE_ATTACK
+         value: 62.2
+      }
+   }
+   promo_data: {
+      max_level: 60
+      add_props: {
+         prop_type: FIGHT_PROP_BASE_ATTACK
+         value: 93.4
+      }
+   }
+   promo_data: {
+      max_level: 70
+      add_props: {
+         prop_type: FIGHT_PROP_BASE_ATTACK
+         value: 124.5
+      }
+   }
+   promo_data: {
+      max_level: 80
+      add_props: {
+         prop_type: FIGHT_PROP_BASE_ATTACK
+         value: 155.6
+      }
+   }
+   promo_data: {
+      max_level: 90
+      add_props: {
+         prop_type: FIGHT_PROP_BASE_ATTACK
+         value: 186.7
+      }
+   }
+}
+name_text_hash_map: 2944936683
diff --git a/pkg/core/keys/weapon.go b/pkg/core/keys/weapon.go
index e809665e97..66ae25e2f2 100644
--- a/pkg/core/keys/weapon.go
+++ b/pkg/core/keys/weapon.go
@@ -59,6 +59,7 @@ var weaponNames = []string{
 	"coolsteel",
 	"cranesechoingcall",
 	"crescentpike",
+	"crimsonmoonssemblance",
 	"darkironsword",
 	"deathmatch",
 	"debateclub",
@@ -244,6 +245,7 @@ const (
 	CoolSteel
 	CranesEchoingCall
 	CrescentPike
+	CrimsonMoonsSemblance
 	DarkIronSword
 	Deathmatch
 	DebateClub
diff --git a/pkg/shortcut/weapons.go b/pkg/shortcut/weapons.go
index a7dfda32b2..29f709a6ba 100644
--- a/pkg/shortcut/weapons.go
+++ b/pkg/shortcut/weapons.go
@@ -52,6 +52,8 @@ var WeaponNameToKey = map[string]keys.Weapon{
 	"crescentpike":                    keys.CrescentPike,
 	"cpike":                           keys.CrescentPike,
 	"pike":                            keys.CrescentPike,
+	"crimsonmoon":                     keys.CrimsonMoonsSemblance,
+	"crimsonmoonssemblance":           keys.CrimsonMoonsSemblance,
 	"darkironsword":                   keys.DarkIronSword,
 	"deathmatch":                      keys.Deathmatch,
 	"debateclub":                      keys.DebateClub,
diff --git a/pkg/simulation/imports.go b/pkg/simulation/imports.go
index d73cce613c..6aaa3df314 100644
--- a/pkg/simulation/imports.go
+++ b/pkg/simulation/imports.go
@@ -173,6 +173,7 @@ import (
 	_ "github.com/genshinsim/gcsim/internal/weapons/spear/calamity"
 	_ "github.com/genshinsim/gcsim/internal/weapons/spear/catch"
 	_ "github.com/genshinsim/gcsim/internal/weapons/spear/crescent"
+	_ "github.com/genshinsim/gcsim/internal/weapons/spear/crimsonmoonssemblance"
 	_ "github.com/genshinsim/gcsim/internal/weapons/spear/deathmatch"
 	_ "github.com/genshinsim/gcsim/internal/weapons/spear/dialoguesofthedesertsages"
 	_ "github.com/genshinsim/gcsim/internal/weapons/spear/dragonbane"
diff --git a/ui/packages/docs/docs/reference/weapons/crimsonmoonssemblance.md b/ui/packages/docs/docs/reference/weapons/crimsonmoonssemblance.md
new file mode 100644
index 0000000000..b74fc1e057
--- /dev/null
+++ b/ui/packages/docs/docs/reference/weapons/crimsonmoonssemblance.md
@@ -0,0 +1,25 @@
+---
+title: Crimson Moon's Semblance
+---
+
+import AoETable from "@site/src/components/AoE/AoETable"; import IssuesTable from "@site/src/components/Issues/IssuesTable"; import NamesList from "@site/src/components/Names/NamesList"; import ParamsTable from "@site/src/components/Params/ParamsTable"; import FieldsTable from "@site/src/components/Fields/FieldsTable";
+
+## AoE Data
+
+<AoETable item_key="crimsonmoonssemblance" data_src="weapon" />
+
+## Known issues
+
+<IssuesTable item_key="crimsonmoonssemblance" data_src="weapon" />
+
+## Names
+
+<NamesList item_key="crimsonmoonssemblance" data_src="weapon" />
+
+## Params
+
+<ParamsTable item_key="crimsonmoonssemblance" data_src="weapon" />
+
+## Fields
+
+<FieldsTable item_key="crimsonmoonssemblance" data_src="weapon" />
diff --git a/ui/packages/docs/src/components/Names/weapon_data.json b/ui/packages/docs/src/components/Names/weapon_data.json
index 6b8362d1c7..45222ba0b6 100644
--- a/ui/packages/docs/src/components/Names/weapon_data.json
+++ b/ui/packages/docs/src/components/Names/weapon_data.json
@@ -65,6 +65,9 @@
     "cpike",
     "pike"
   ],
+  "crimsonmoonssemblance": [
+    "crimsonmoon"
+  ],
   "darkironsword": [],
   "deathmatch": [],
   "debateclub": [],
diff --git a/ui/packages/localization/src/locales/names.generated.json b/ui/packages/localization/src/locales/names.generated.json
index 3c12a30470..a4e25e018b 100644
--- a/ui/packages/localization/src/locales/names.generated.json
+++ b/ui/packages/localization/src/locales/names.generated.json
@@ -118,6 +118,7 @@
          "coolsteel": "冷刃",
          "cranesechoingcall": "鹤鸣余音",
          "crescentpike": "流月针",
+         "crimsonmoonssemblance": "赤月之形",
          "darkironsword": "暗铁剑",
          "deathmatch": "决斗之枪",
          "debateclub": "以理服人",
@@ -718,6 +719,7 @@
          "coolsteel": "Cool Steel",
          "cranesechoingcall": "Crane's Echoing Call",
          "crescentpike": "Crescent Pike",
+         "crimsonmoonssemblance": "Crimson Moon's Semblance",
          "darkironsword": "Dark Iron Sword",
          "deathmatch": "Deathmatch",
          "debateclub": "Debate Club",
@@ -1318,6 +1320,7 @@
          "coolsteel": "Kühle Klinge",
          "cranesechoingcall": "Widerhallender Ruf des Kranichs",
          "crescentpike": "Mondpike",
+         "crimsonmoonssemblance": "Form des scharlachroten Mondes",
          "darkironsword": "Dunkles Eisenschwert",
          "deathmatch": "Duelllanze",
          "debateclub": "Schlagfestes Argument",
@@ -1918,6 +1921,7 @@
          "coolsteel": "冷刃",
          "cranesechoingcall": "鶴鳴の余韻",
          "crescentpike": "流月の針",
+         "crimsonmoonssemblance": "赤月のシルエット",
          "darkironsword": "暗鉄剣",
          "deathmatch": "死闘の槍",
          "debateclub": "理屈責め",
@@ -2517,6 +2521,7 @@
          "coolsteel": "차가운 칼날",
          "cranesechoingcall": "학의 여음",
          "crescentpike": "유월창",
+         "crimsonmoonssemblance": "붉은 달의 형상",
          "darkironsword": "암철검",
          "deathmatch": "결투의 창",
          "debateclub": "훌륭한 대화수단",
@@ -3117,6 +3122,7 @@
          "coolsteel": "Холодное лезвие",
          "cranesechoingcall": "Звонкий клич журавля",
          "crescentpike": "Пика полумесяца",
+         "crimsonmoonssemblance": "Очертания алой луны",
          "darkironsword": "Тёмный железный меч",
          "deathmatch": "Смертельный бой",
          "debateclub": "Дубина переговоров",
@@ -3717,6 +3723,7 @@
          "coolsteel": "Hoja Fría",
          "cranesechoingcall": "Reverberación de la Grulla",
          "crescentpike": "Pica Luna Creciente",
+         "crimsonmoonssemblance": "Semblante de la Luna Carmesí",
          "darkironsword": "Espada de Hierro Oscuro",
          "deathmatch": "Lanza del Duelo",
          "debateclub": "Garrote del Debate",
diff --git a/ui/packages/ui/src/Data/weapon_data.generated.json b/ui/packages/ui/src/Data/weapon_data.generated.json
index e4aeb7a6f3..52169fbffa 100644
--- a/ui/packages/ui/src/Data/weapon_data.generated.json
+++ b/ui/packages/ui/src/Data/weapon_data.generated.json
@@ -208,6 +208,14 @@
       "image_name": "UI_EquipIcon_Pole_Exotic",
       "name_text_hash_map ": "578575283"
     },
+    "crimsonmoonssemblance": {
+      "id": 13512,
+      "key": "crimsonmoonssemblance",
+      "rarity": 5,
+      "weapon_class": "WEAPON_POLE",
+      "image_name": "UI_EquipIcon_Pole_BloodMoon",
+      "name_text_hash_map ": "2944936683"
+    },
     "darkironsword": {
       "id": 11304,
       "key": "darkironsword",