diff --git a/hwe/sammo/InheritancePointManager.php b/hwe/sammo/InheritancePointManager.php
index d185d607..b0e9e5a4 100644
--- a/hwe/sammo/InheritancePointManager.php
+++ b/hwe/sammo/InheritancePointManager.php
@@ -152,19 +152,7 @@ class InheritancePointManager
     };
     switch ($key) {
       case InheritanceKey::dex:
-        $extractFn = function () use ($general, $multiplier) {
-          $dexLimit = Util::array_last(getDexLevelList())[0];
-          $totalDex = 0;
-          foreach (array_keys(GameUnitConst::allType()) as $armType) {
-            $subDex = $general->getVar("dex{$armType}");
-            if ($subDex > $dexLimit) {
-              $totalDex += ($subDex - $dexLimit) / 3;
-              $subDex = $dexLimit;
-            }
-            $totalDex += $subDex;
-          }
-          return [$totalDex * $multiplier, null];
-        };
+        $extractFn = fn () => [$this->getDexInheritancePoint($general), null];
         break;
       case InheritanceKey::betting:
         $extractFn = function () use ($general, $multiplier) {
@@ -189,6 +177,28 @@ class InheritancePointManager
     return $value;
   }
 
+  /** @param null|int[] $armTypes */
+  public function getDexInheritancePoint(
+    General $general,
+    ?int $dexLimit = null,
+    ?array $armTypes = null
+  ): float
+  {
+    $dexLimit ??= Util::array_last(getDexLevelList())[0];
+    $armTypes ??= array_keys(GameUnitConst::allType());
+    $multiplier = $this->getInheritancePointType(InheritanceKey::dex)->pointCoeff;
+    $totalDex = 0;
+    foreach ($armTypes as $armType) {
+      $subDex = CentennialAllStarGrowthService::recordableValue($general, "dex{$armType}");
+      if ($subDex > $dexLimit) {
+        $totalDex += ($subDex - $dexLimit) / 3;
+        $subDex = $dexLimit;
+      }
+      $totalDex += $subDex;
+    }
+    return $totalDex * $multiplier;
+  }
+
 
   public function setInheritancePoint(General $general, InheritanceKey $key, $value, $aux = null)
   {
diff --git a/tests/CentennialAllStarGrowthTest.php b/tests/CentennialAllStarGrowthTest.php
index 579c0064..ccca836d 100644
--- a/tests/CentennialAllStarGrowthTest.php
+++ b/tests/CentennialAllStarGrowthTest.php
@@ -5,6 +5,7 @@ use sammo\CentennialAllStarGrowth;
 use sammo\CentennialAllStarGrowthService;
 use sammo\General;
 use sammo\GameConst;
+use sammo\InheritancePointManager;
 
 $loader = require __DIR__ . '/../vendor/autoload.php';
 $loader->addPsr4('sammo\\', __DIR__ . '/../hwe/sammo', true);
@@ -371,6 +372,28 @@ final class CentennialAllStarGrowthTest extends TestCase
         self::assertSame(900000, CentennialAllStarGrowth::dexFloor(900000, 1));
     }
 
+    public function testSynchronizedDexDoesNotIncreaseInheritancePoint(): void
+    {
+        $vars = $this->emptyGeneralVars();
+        $vars['dex1'] = 1_300_000;
+        $vars['dex2'] = 1_300_000;
+        $aux = CentennialAllStarGrowthService::initialAux(
+            $this->singleDexTarget('inheritance', 0),
+            []
+        );
+        $aux['granted']['dex1'] = 1_000_000;
+        $general = $this->createStateGeneralMock($vars, $aux);
+
+        self::assertSame(
+            1_400.0,
+            InheritancePointManager::getInstance()->getDexInheritancePoint(
+                $general,
+                1_000_000,
+                [1, 2, 3, 4, 5]
+            )
+        );
+    }
+
     public function testNpcDexStopsAtFortyPercentOfHistoricalTarget(): void
     {
         $target = 900000;