...

core/src/mindustry/entities/TargetPriority.java

@@ -3,5 +3,6 @@ package mindustry.entities;
 /** A higher ordinal means a higher priority. Higher priority blocks will always get targeted over those of lower priority, regardless of distance. */
 public enum TargetPriority{
     base,
-    turret
+    turret,
+    core
 }