diff --git a/Common/src/main/java/at/petrak/hexcasting/api/casting/mishaps/MishapBadCaster.kt b/Common/src/main/java/at/petrak/hexcasting/api/casting/mishaps/MishapBadCaster.kt
new file mode 100644
index 0000000000..99199f9561
--- /dev/null
+++ b/Common/src/main/java/at/petrak/hexcasting/api/casting/mishaps/MishapBadCaster.kt
@@ -0,0 +1,17 @@
+package at.petrak.hexcasting.api.casting.mishaps
+
+import at.petrak.hexcasting.api.casting.eval.CastingEnvironment
+import at.petrak.hexcasting.api.casting.iota.Iota
+import at.petrak.hexcasting.api.pigment.FrozenPigment
+import net.minecraft.world.item.DyeColor
+
+class MishapBadCaster: Mishap() {
+    override fun accentColor(ctx: CastingEnvironment, errorCtx: Context): FrozenPigment =
+        dyeColor(DyeColor.RED)
+
+    override fun execute(env: CastingEnvironment, errorCtx: Context, stack: MutableList<Iota>) {
+    }
+
+    override fun errorMessage(ctx: CastingEnvironment, errorCtx: Context) =
+        error("bad_caster")
+}
\ No newline at end of file
diff --git a/Common/src/main/java/at/petrak/hexcasting/common/casting/actions/spells/sentinel/OpCreateSentinel.kt b/Common/src/main/java/at/petrak/hexcasting/common/casting/actions/spells/sentinel/OpCreateSentinel.kt
index 1c0b2793cd..3b45740587 100644
--- a/Common/src/main/java/at/petrak/hexcasting/common/casting/actions/spells/sentinel/OpCreateSentinel.kt
+++ b/Common/src/main/java/at/petrak/hexcasting/common/casting/actions/spells/sentinel/OpCreateSentinel.kt
@@ -6,6 +6,7 @@ import at.petrak.hexcasting.api.casting.castables.SpellAction
 import at.petrak.hexcasting.api.casting.eval.CastingEnvironment
 import at.petrak.hexcasting.api.casting.getVec3
 import at.petrak.hexcasting.api.casting.iota.Iota
+import at.petrak.hexcasting.api.casting.mishaps.MishapBadCaster
 import at.petrak.hexcasting.api.misc.MediaConstants
 import at.petrak.hexcasting.api.player.Sentinel
 import at.petrak.hexcasting.xplat.IXplatAbstractions
@@ -19,6 +20,9 @@ class OpCreateSentinel(val extendsRange: Boolean) : SpellAction {
             args: List<Iota>,
             env: CastingEnvironment
     ): SpellAction.Result {
+        if (env.castingEntity !is ServerPlayer)
+            throw MishapBadCaster()
+
         val target = args.getVec3(0, argc)
         env.assertVecInRange(target)
 
diff --git a/Common/src/main/java/at/petrak/hexcasting/common/casting/actions/spells/sentinel/OpDestroySentinel.kt b/Common/src/main/java/at/petrak/hexcasting/common/casting/actions/spells/sentinel/OpDestroySentinel.kt
index 97aaf692c4..43785a2adb 100644
--- a/Common/src/main/java/at/petrak/hexcasting/common/casting/actions/spells/sentinel/OpDestroySentinel.kt
+++ b/Common/src/main/java/at/petrak/hexcasting/common/casting/actions/spells/sentinel/OpDestroySentinel.kt
@@ -5,6 +5,7 @@ import at.petrak.hexcasting.api.casting.RenderedSpell
 import at.petrak.hexcasting.api.casting.castables.SpellAction
 import at.petrak.hexcasting.api.casting.eval.CastingEnvironment
 import at.petrak.hexcasting.api.casting.iota.Iota
+import at.petrak.hexcasting.api.casting.mishaps.MishapBadCaster
 import at.petrak.hexcasting.api.casting.mishaps.MishapLocationInWrongDimension
 import at.petrak.hexcasting.api.misc.MediaConstants
 import at.petrak.hexcasting.xplat.IXplatAbstractions
@@ -16,6 +17,9 @@ object OpDestroySentinel : SpellAction {
             args: List<Iota>,
             env: CastingEnvironment
     ): SpellAction.Result {
+        if (env.castingEntity !is ServerPlayer)
+            throw MishapBadCaster()
+
         val sentinel = IXplatAbstractions.INSTANCE.getSentinel(env.castingEntity as? ServerPlayer)
 
         // TODO why can't you remove things from other dimensions?
diff --git a/Common/src/main/java/at/petrak/hexcasting/common/casting/actions/spells/sentinel/OpGetSentinelPos.kt b/Common/src/main/java/at/petrak/hexcasting/common/casting/actions/spells/sentinel/OpGetSentinelPos.kt
index b038aa92bf..fa56812ca5 100644
--- a/Common/src/main/java/at/petrak/hexcasting/common/casting/actions/spells/sentinel/OpGetSentinelPos.kt
+++ b/Common/src/main/java/at/petrak/hexcasting/common/casting/actions/spells/sentinel/OpGetSentinelPos.kt
@@ -5,6 +5,7 @@ import at.petrak.hexcasting.api.casting.castables.ConstMediaAction
 import at.petrak.hexcasting.api.casting.eval.CastingEnvironment
 import at.petrak.hexcasting.api.casting.iota.Iota
 import at.petrak.hexcasting.api.casting.iota.NullIota
+import at.petrak.hexcasting.api.casting.mishaps.MishapBadCaster
 import at.petrak.hexcasting.api.casting.mishaps.MishapLocationInWrongDimension
 import at.petrak.hexcasting.api.misc.MediaConstants
 import at.petrak.hexcasting.xplat.IXplatAbstractions
@@ -14,6 +15,9 @@ object OpGetSentinelPos : ConstMediaAction {
     override val argc = 0
     override val mediaCost: Long = MediaConstants.DUST_UNIT / 10
     override fun execute(args: List<Iota>, env: CastingEnvironment): List<Iota> {
+        if (env.castingEntity !is ServerPlayer)
+            throw MishapBadCaster()
+
         val sentinel = IXplatAbstractions.INSTANCE.getSentinel(env.castingEntity as? ServerPlayer) ?: return listOf(NullIota())
         if (sentinel.dimension != env.world.dimension())
             throw MishapLocationInWrongDimension(sentinel.dimension.location())
diff --git a/Common/src/main/java/at/petrak/hexcasting/common/casting/actions/spells/sentinel/OpGetSentinelWayfind.kt b/Common/src/main/java/at/petrak/hexcasting/common/casting/actions/spells/sentinel/OpGetSentinelWayfind.kt
index 87eb1547cb..cad52447ed 100644
--- a/Common/src/main/java/at/petrak/hexcasting/common/casting/actions/spells/sentinel/OpGetSentinelWayfind.kt
+++ b/Common/src/main/java/at/petrak/hexcasting/common/casting/actions/spells/sentinel/OpGetSentinelWayfind.kt
@@ -6,6 +6,7 @@ import at.petrak.hexcasting.api.casting.eval.CastingEnvironment
 import at.petrak.hexcasting.api.casting.getVec3
 import at.petrak.hexcasting.api.casting.iota.Iota
 import at.petrak.hexcasting.api.casting.iota.NullIota
+import at.petrak.hexcasting.api.casting.mishaps.MishapBadCaster
 import at.petrak.hexcasting.api.casting.mishaps.MishapLocationInWrongDimension
 import at.petrak.hexcasting.api.misc.MediaConstants
 import at.petrak.hexcasting.xplat.IXplatAbstractions
@@ -17,6 +18,9 @@ object OpGetSentinelWayfind : ConstMediaAction {
     override val argc = 1
     override val mediaCost: Long = MediaConstants.DUST_UNIT / 10
     override fun execute(args: List<Iota>, env: CastingEnvironment): List<Iota> {
+        if (env.castingEntity !is ServerPlayer)
+            throw MishapBadCaster()
+
         val from = args.getVec3(0, argc)
 
         val sentinel = IXplatAbstractions.INSTANCE.getSentinel(env.castingEntity as? ServerPlayer) ?: return listOf(NullIota())
diff --git a/Common/src/main/resources/assets/hexcasting/lang/en_us.flatten.json5 b/Common/src/main/resources/assets/hexcasting/lang/en_us.flatten.json5
index 7b98d7825d..7807a6e802 100644
--- a/Common/src/main/resources/assets/hexcasting/lang/en_us.flatten.json5
+++ b/Common/src/main/resources/assets/hexcasting/lang/en_us.flatten.json5
@@ -921,6 +921,7 @@
       invalid_spell_datum_type: "Tried to use a value of invalid type as a SpellDatum: %s (class %s). This is a bug in the mod.",
       unknown: "threw an exception (%s). This is a bug in the mod.",
       stack_size: "Exceeded the size limit of the stack",
+      bad_caster: "Tried to execute a pattern that requires a greater mind",
       
       invalid_value: {
         "": "expected %s at index %s of the stack, but got %s",