diff --git a/plugin/src/main/java/com/denizenscript/denizen/scripts/commands/world/ModifyBlockCommand.java b/plugin/src/main/java/com/denizenscript/denizen/scripts/commands/world/ModifyBlockCommand.java
index 5726c2b11a..4aaca77a29 100644
--- a/plugin/src/main/java/com/denizenscript/denizen/scripts/commands/world/ModifyBlockCommand.java
+++ b/plugin/src/main/java/com/denizenscript/denizen/scripts/commands/world/ModifyBlockCommand.java
@@ -1,13 +1,10 @@
 package com.denizenscript.denizen.scripts.commands.world;
 
+import com.denizenscript.denizen.objects.*;
 import com.denizenscript.denizen.utilities.DenizenAPI;
 import com.denizenscript.denizen.utilities.debugging.Debug;
 import com.denizenscript.denizen.nms.NMSHandler;
 import com.denizenscript.denizen.nms.interfaces.WorldHelper;
-import com.denizenscript.denizen.objects.CuboidTag;
-import com.denizenscript.denizen.objects.EllipsoidTag;
-import com.denizenscript.denizen.objects.LocationTag;
-import com.denizenscript.denizen.objects.MaterialTag;
 import com.denizenscript.denizencore.exceptions.InvalidArgumentsException;
 import com.denizenscript.denizencore.objects.*;
 import com.denizenscript.denizencore.objects.core.ElementTag;
@@ -24,10 +21,16 @@
 import org.bukkit.Material;
 import org.bukkit.World;
 import org.bukkit.entity.EntityType;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.Event;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.Listener;
+import org.bukkit.event.block.BlockBreakEvent;
 import org.bukkit.event.block.BlockPhysicsEvent;
+import org.bukkit.event.block.BlockPlaceEvent;
 import org.bukkit.event.entity.EntityChangeBlockEvent;
+import org.bukkit.inventory.EquipmentSlot;
 import org.bukkit.scheduler.BukkitRunnable;
 
 import java.util.ArrayList;
@@ -37,8 +40,8 @@ public class ModifyBlockCommand extends AbstractCommand implements Listener, Hol
 
     public ModifyBlockCommand() {
         setName("modifyblock");
-        setSyntax("modifyblock [<location>|.../<ellipsoid>/<cuboid>] [<material>|...] (no_physics/naturally) (delayed) (<script>) (<percent chance>|...)");
-        setRequiredArguments(2, 6);
+        setSyntax("modifyblock [<location>|.../<ellipsoid>/<cuboid>] [<material>|...] (no_physics/naturally) (delayed) (<script>) (<percent chance>|...) (source:<player>)");
+        setRequiredArguments(2, 7);
         DenizenAPI.getCurrentInstance().getServer().getPluginManager().registerEvents(this, DenizenAPI.getCurrentInstance());
         // Keep the list empty automatically - we don't want to still block physics so much later that something else edited the block!
         Bukkit.getScheduler().scheduleSyncRepeatingTask(DenizenAPI.getCurrentInstance(), new Runnable() {
@@ -54,9 +57,9 @@ public void run() {
 
     // <--[command]
     // @Name ModifyBlock
-    // @Syntax modifyblock [<location>|.../<ellipsoid>/<cuboid>] [<material>|...] (no_physics/naturally) (delayed) (<script>) (<percent chance>|...)
+    // @Syntax modifyblock [<location>|.../<ellipsoid>/<cuboid>] [<material>|...] (no_physics/naturally) (delayed) (<script>) (<percent chance>|...) (source:<player>)
     // @Required 2
-    // @Maximum 6
+    // @Maximum 7
     // @Short Modifies blocks.
     // @Group world
     //
@@ -70,6 +73,7 @@ public void run() {
     // Use 'delayed' to make the modifyblock slowly edit blocks at a time pace roughly equivalent to the server's limits.
     // Note that specify a list of locations will take more time in parsing than in the actual block modification.
     // Optionally, specify a script to be ran after the delayed edits finish. (Doesn't fire if delayed is not set.)
+    // Optionally, specify a source player. When set, Bukkit events will fire that identify that player as the source of a change, and potentially cancel the change.
     //
     // The modifyblock command is ~waitable. Refer to <@link language ~waitable>.
     //
@@ -134,6 +138,11 @@ else if (!scriptEntry.hasObject("depth")
                     && arg.matchesInteger()) {
                 scriptEntry.addObject("depth", new ElementTag(arg.getValue()));
             }
+            else if (!scriptEntry.hasObject("source")
+                    && arg.matchesPrefix("source")
+                    && arg.matchesArgumentType(PlayerTag.class)) {
+                scriptEntry.addObject("source", arg.asType(PlayerTag.class));
+            }
             else if (arg.matches("no_physics")) {
                 scriptEntry.addObject("physics", new ElementTag(false));
             }
@@ -188,6 +197,7 @@ public void execute(final ScriptEntry scriptEntry) {
         final ElementTag heightElement = scriptEntry.getElement("height");
         final ElementTag depthElement = scriptEntry.getElement("depth");
         final ScriptTag script = scriptEntry.getObjectTag("script");
+        final PlayerTag source = scriptEntry.getObjectTag("source");
         ListTag percents = scriptEntry.getObjectTag("percents");
 
         if (percents != null && percents.size() != materials.size()) {
@@ -198,7 +208,6 @@ public void execute(final ScriptEntry scriptEntry) {
         final List<MaterialTag> materialList = materials.filter(MaterialTag.class, scriptEntry);
 
         if (scriptEntry.dbCallShouldDebug()) {
-
             Debug.report(scriptEntry, getName(), (locations == null ? location_list.debug() : ArgumentHelper.debugList("locations", locations))
                     + materials.debug()
                     + physics.debug()
@@ -208,10 +217,11 @@ public void execute(final ScriptEntry scriptEntry) {
                     + natural.debug()
                     + delayed.debug()
                     + (script != null ? script.debug() : "")
-                    + (percents != null ? percents.debug() : ""));
-
+                    + (percents != null ? percents.debug() : "")
+                    + (source != null ? source.debug() : ""));
         }
 
+        Player sourcePlayer = source == null ? null : source.getPlayerEntity();
         final boolean doPhysics = physics.asBoolean();
         final boolean isNatural = natural.asBoolean();
         final int radius = radiusElement.asInt();
@@ -262,7 +272,7 @@ public void run() {
                         else {
                             nLoc = LocationTag.valueOf(location_list.get(index));
                         }
-                        handleLocation(nLoc, index, materialList, doPhysics, isNatural, radius, height, depth, percs);
+                        handleLocation(nLoc, index, materialList, doPhysics, isNatural, radius, height, depth, percs, sourcePlayer, scriptEntry);
                         index++;
                         if (System.currentTimeMillis() - start > 50) {
                             break;
@@ -294,13 +304,13 @@ public void run() {
             int index = 0;
             if (locations != null) {
                 for (ObjectTag obj : locations) {
-                    handleLocation((LocationTag) obj, index, materialList, doPhysics, isNatural, radius, height, depth, percentages);
+                    handleLocation((LocationTag) obj, index, materialList, doPhysics, isNatural, radius, height, depth, percentages, sourcePlayer, scriptEntry);
                     index++;
                 }
             }
             else {
                 for (String str : location_list) {
-                    handleLocation(LocationTag.valueOf(str), index, materialList, doPhysics, isNatural, radius, height, depth, percentages);
+                    handleLocation(LocationTag.valueOf(str), index, materialList, doPhysics, isNatural, radius, height, depth, percentages, sourcePlayer, scriptEntry);
                     index++;
                 }
             }
@@ -329,7 +339,7 @@ void postComplete(Location loc, boolean was_static) {
     }
 
     void handleLocation(LocationTag location, int index, List<MaterialTag> materialList, boolean doPhysics,
-                        boolean isNatural, int radius, int height, int depth, List<Float> percents) {
+                        boolean isNatural, int radius, int height, int depth, List<Float> percents, Player source, ScriptEntry entry) {
 
         MaterialTag material;
         if (percents == null) {
@@ -354,6 +364,22 @@ void handleLocation(LocationTag location, int index, List<MaterialTag> materialL
         location.setX(location.getBlockX());
         location.setY(location.getBlockY());
         location.setZ(location.getBlockZ());
+        if (source != null) {
+            Event event;
+            if (material.getMaterial() == Material.AIR) {
+                event = new BlockBreakEvent(location.getBlock(), source);
+            }
+            else {
+                event = new BlockPlaceEvent(location.getBlock(), material.getModernData().getBlockState(), location.getBlock(), new ItemTag(material, 1).getItemStack(), source, true, EquipmentSlot.HAND);
+            }
+            Bukkit.getPluginManager().callEvent(event);
+            if (((Cancellable) event).isCancelled()) {
+                if (entry.dbCallShouldDebug()) {
+                    Debug.echoDebug(entry, "Source event cancelled, not changing block.");
+                }
+                return;
+            }
+        }
         setBlock(location, material, doPhysics, isNatural);
 
         if (radius != 0) {