diff --git a/src/main/kotlin/com/skillw/asahi/internal/namespacing/prefix/lang/Lang.kt b/src/main/kotlin/com/skillw/asahi/internal/namespacing/prefix/lang/Lang.kt
index eb55af27..92008e7e 100644
--- a/src/main/kotlin/com/skillw/asahi/internal/namespacing/prefix/lang/Lang.kt
+++ b/src/main/kotlin/com/skillw/asahi/internal/namespacing/prefix/lang/Lang.kt
@@ -20,6 +20,11 @@ private fun `null`() = prefixParser {
     result { null }
 }
 
+@AsahiPrefix(["null-str"], "lang")
+private fun nullStr() = prefixParser {
+    result { "null" }
+}
+
 @AsahiPrefix(["pass"], "lang")
 private fun pass() = prefixParser {
     result { "" }
diff --git a/src/main/kotlin/com/skillw/pouvoir/api/feature/hologram/HologramBuilder.kt b/src/main/kotlin/com/skillw/pouvoir/api/feature/hologram/HologramBuilder.kt
index afc8f5f1..47213068 100644
--- a/src/main/kotlin/com/skillw/pouvoir/api/feature/hologram/HologramBuilder.kt
+++ b/src/main/kotlin/com/skillw/pouvoir/api/feature/hologram/HologramBuilder.kt
@@ -107,7 +107,7 @@ class HologramBuilder(private val location: Location) {
      * @return 构建好的Hologram
      */
     fun build(): IHologram {
-        val hologram = hologramManager.createHologram(location.clone(), content)
+        val hologram = hologramManager.createHologram(location.clone(), content, viewers)
         if (stay != -1L) {
             each?.also { vector ->
                 var count = 0
diff --git a/src/main/kotlin/com/skillw/pouvoir/api/feature/hologram/IHologram.kt b/src/main/kotlin/com/skillw/pouvoir/api/feature/hologram/IHologram.kt
index 947e9afe..e422f88c 100644
--- a/src/main/kotlin/com/skillw/pouvoir/api/feature/hologram/IHologram.kt
+++ b/src/main/kotlin/com/skillw/pouvoir/api/feature/hologram/IHologram.kt
@@ -2,20 +2,10 @@ package com.skillw.pouvoir.api.feature.hologram
 
 import com.skillw.pouvoir.api.plugin.map.component.Keyable
 import org.bukkit.Location
-import org.bukkit.entity.Player
 
 /** 全息接口 */
 interface IHologram : Keyable<String> {
 
-    /** 坐标 */
-    var location: Location
-
-    /** 内容 */
-    val content: List<String>
-
-    /** 可看到的玩家 */
-    val viewers: MutableSet<Player>
-
     /**
      * 传送
      *
diff --git a/src/main/kotlin/com/skillw/pouvoir/api/manager/sub/HologramManager.kt b/src/main/kotlin/com/skillw/pouvoir/api/manager/sub/HologramManager.kt
index a143d254..8fd42667 100644
--- a/src/main/kotlin/com/skillw/pouvoir/api/manager/sub/HologramManager.kt
+++ b/src/main/kotlin/com/skillw/pouvoir/api/manager/sub/HologramManager.kt
@@ -3,6 +3,7 @@ package com.skillw.pouvoir.api.manager.sub
 import com.skillw.pouvoir.api.feature.hologram.IHologram
 import com.skillw.pouvoir.api.manager.Manager
 import org.bukkit.Location
+import org.bukkit.entity.Player
 
 /**
  * HologramManager
@@ -17,5 +18,5 @@ abstract class HologramManager : Manager {
      * @param content
      * @return
      */
-    abstract fun createHologram(location: Location, content: List<String>): IHologram
+    abstract fun createHologram(location: Location, content: List<String>, players: Set<Player>): IHologram
 }
\ No newline at end of file
diff --git a/src/main/kotlin/com/skillw/pouvoir/internal/feature/hologram/Hologram.kt b/src/main/kotlin/com/skillw/pouvoir/internal/feature/hologram/Hologram.kt
index f4f15318..8bade5c5 100644
--- a/src/main/kotlin/com/skillw/pouvoir/internal/feature/hologram/Hologram.kt
+++ b/src/main/kotlin/com/skillw/pouvoir/internal/feature/hologram/Hologram.kt
@@ -5,28 +5,28 @@ import org.bukkit.Location
 import org.bukkit.entity.Player
 import java.util.concurrent.ConcurrentHashMap
 
-class Hologram(override var location: Location, override val content: List<String>) : IHologram {
+class Hologram private constructor(var location: Location, val content: List<String>) : IHologram {
 
     override val key = (location.toString().hashCode() + content.hashCode()).toString()
-    override val viewers = ConcurrentHashSet<Player>()
+    val viewers = ConcurrentHashSet<Player>()
 
-    constructor(location: Location, content: List<String>, vararg viewers: Player) : this(location, content) {
-        this.viewers.addAll(viewers)
+
+    private val lines = ConcurrentHashMap<Int, HologramLine>()
+
+    init {
         content.forEachIndexed { index, line ->
             lines[index] =
                 HologramLine(location.clone().add(0.0, (((content.size - 1) - index) * 0.3), 0.0), line, this.viewers)
         }
     }
 
-    constructor(location: Location, content: List<String>, viewers: Set<Player>) : this(location, content) {
+    constructor(location: Location, content: List<String>, vararg viewers: Player) : this(location, content) {
         this.viewers.addAll(viewers)
-        content.forEachIndexed { index, line ->
-            lines[index] =
-                HologramLine(location.clone().add(0.0, (((content.size - 1) - index) * 0.3), 0.0), line, this.viewers)
-        }
     }
 
-    private val lines = ConcurrentHashMap<Int, HologramLine>()
+    constructor(location: Location, content: List<String>, viewers: Set<Player>) : this(location, content) {
+        this.viewers.addAll(viewers)
+    }
 
     override fun teleport(location: Location) {
         this.location = location
diff --git a/src/main/kotlin/com/skillw/pouvoir/internal/manager/HologramManagerImpl.kt b/src/main/kotlin/com/skillw/pouvoir/internal/manager/HologramManagerImpl.kt
index 2eaa2ead..71f76f5d 100644
--- a/src/main/kotlin/com/skillw/pouvoir/internal/manager/HologramManagerImpl.kt
+++ b/src/main/kotlin/com/skillw/pouvoir/internal/manager/HologramManagerImpl.kt
@@ -5,13 +5,14 @@ import com.skillw.pouvoir.api.feature.hologram.IHologram
 import com.skillw.pouvoir.api.manager.sub.HologramManager
 import com.skillw.pouvoir.internal.feature.hologram.Hologram
 import org.bukkit.Location
+import org.bukkit.entity.Player
 
 internal object HologramManagerImpl : HologramManager() {
     override val key = "HologramManagerImpl"
     override val priority = 3
     override val subPouvoir = Pouvoir
 
-    override fun createHologram(location: Location, content: List<String>): IHologram {
-        return Hologram(location, content)
+    override fun createHologram(location: Location, content: List<String>, players: Set<Player>): IHologram {
+        return Hologram(location, content, players)
     }
 }
\ No newline at end of file