diff --git a/data/skill/prayer/altar.objs.toml b/data/skill/prayer/altar.objs.toml
index 379e9979e7..1fbf5397b4 100644
--- a/data/skill/prayer/altar.objs.toml
+++ b/data/skill/prayer/altar.objs.toml
@@ -326,6 +326,10 @@ examine = "A shrine for the faithful to worship at."
 id = 55340
 examine = "Shrine to the glory of Zaros."
 
+[prayer_altar_zaros_senntisten]
+id = 47120
+examine = "An ancient altar to the glory of Zaros."
+
 [prayer_altar_warped_construction]
 id = 55667
 examine = "A shrine for the faithful to worship at."
diff --git a/game/src/main/kotlin/content/skill/prayer/bone/PrayerAltars.kt b/game/src/main/kotlin/content/skill/prayer/bone/PrayerAltars.kt
index 4f2d8646f9..fbb78d42f2 100644
--- a/game/src/main/kotlin/content/skill/prayer/bone/PrayerAltars.kt
+++ b/game/src/main/kotlin/content/skill/prayer/bone/PrayerAltars.kt
@@ -1,5 +1,9 @@
 package content.skill.prayer.bone
 
+import content.skill.prayer.PrayerConfigs.PRAYERS
+import content.skill.prayer.PrayerConfigs.USING_QUICK_PRAYERS
+import content.skill.prayer.getActivePrayerVarKey
+import content.skill.prayer.isCurses
 import world.gregs.voidps.engine.Script
 import world.gregs.voidps.engine.client.message
 import world.gregs.voidps.engine.entity.character.player.Player
@@ -8,6 +12,18 @@ import world.gregs.voidps.engine.entity.character.player.skill.Skill
 class PrayerAltars : Script {
 
     init {
+        objectOperate("Pray", "prayer_altar_zaros,prayer_altar_zaros_senntisten") {
+            prayAtZaros()
+        }
+
+        objectOperate("Pray-at", "prayer_altar_zaros,prayer_altar_zaros_senntisten") {
+            prayAtZaros()
+        }
+
+        objectOperate("Convert", "prayer_altar_zaros,prayer_altar_zaros_senntisten") {
+            prayAtZaros()
+        }
+
         objectOperate("Pray", "prayer_altar_*") {
             pray()
         }
@@ -31,4 +47,22 @@ class PrayerAltars : Script {
             set("prayer_point_power_task", true)
         }
     }
+
+    private fun Player.prayAtZaros() {
+        if (levels.getOffset(Skill.Prayer) < 0) {
+            levels.set(Skill.Prayer, levels.getMax(Skill.Prayer))
+            set("prayer_point_power_task", true)
+            message("You recharge your Prayer points.")
+        }
+        switchPrayerBook()
+    }
+
+    private fun Player.switchPrayerBook() {
+        clear(getActivePrayerVarKey())
+        this[USING_QUICK_PRAYERS] = false
+        val curses = !isCurses()
+        set(PRAYERS, if (curses) "curses" else "normal")
+        anim("altar_pray")
+        message(if (curses) "You switch to the Ancient Curses." else "You switch to the normal Prayer book.")
+    }
 }
diff --git a/game/src/test/kotlin/content/skill/prayer/PrayerTest.kt b/game/src/test/kotlin/content/skill/prayer/PrayerTest.kt
index 0cef872cea..afc1dfcf3f 100644
--- a/game/src/test/kotlin/content/skill/prayer/PrayerTest.kt
+++ b/game/src/test/kotlin/content/skill/prayer/PrayerTest.kt
@@ -1,6 +1,9 @@
 package content.skill.prayer
 
 import WorldTest
+import content.skill.prayer.PrayerConfigs.ACTIVE_PRAYERS
+import content.skill.prayer.PrayerConfigs.PRAYERS
+import content.skill.prayer.PrayerConfigs.USING_QUICK_PRAYERS
 import interfaceOption
 import itemOnObject
 import itemOption
@@ -9,6 +12,7 @@ import org.junit.jupiter.api.Assertions.*
 import org.junit.jupiter.api.DynamicTest.dynamicTest
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.TestFactory
+import world.gregs.voidps.engine.client.instruction.handle.interactObject
 import world.gregs.voidps.engine.entity.character.player.skill.Skill
 import world.gregs.voidps.engine.entity.character.player.skill.exp.Experience
 import world.gregs.voidps.engine.entity.obj.GameObjects
@@ -18,6 +22,43 @@ import world.gregs.voidps.type.Tile
 
 internal class PrayerTest : WorldTest() {
 
+    @Test
+    fun `Home Zaros altar recharges and switches prayers`() {
+        val player = createPlayer()
+        player.experience.set(Skill.Prayer, Experience.MAXIMUM_EXPERIENCE)
+        player.levels.set(Skill.Prayer, 1)
+        val altar = GameObjects.add("prayer_altar_zaros", player.tile)
+
+        player.interactObject(altar, "Convert")
+        tick()
+
+        assertEquals(player.levels.getMax(Skill.Prayer), player.levels.get(Skill.Prayer))
+        assertEquals("curses", player[PRAYERS])
+    }
+
+    @Test
+    fun `Senntisten Zaros altar recharges and switches prayers`() {
+        val player = createPlayer()
+        player.experience.set(Skill.Prayer, Experience.MAXIMUM_EXPERIENCE)
+        player.levels.set(Skill.Prayer, 1)
+        val altar = GameObjects.add("prayer_altar_zaros_senntisten", player.tile)
+        player.addVarbit(ACTIVE_PRAYERS, "protect_from_melee")
+        player[USING_QUICK_PRAYERS] = true
+
+        player.interactObject(altar, "Pray")
+        tick()
+
+        assertEquals(player.levels.getMax(Skill.Prayer), player.levels.get(Skill.Prayer))
+        assertEquals("curses", player[PRAYERS])
+        assertFalse(player.containsVarbit(ACTIVE_PRAYERS, "protect_from_melee"))
+        assertFalse(player[USING_QUICK_PRAYERS, false])
+
+        player.interactObject(altar, "Pray-at")
+        tick()
+
+        assertFalse(player.isCurses())
+    }
+
     @Test
     fun `Active prayers drain prayer points`() {
         val player = createPlayer()