diff --git a/Source/msg.cpp b/Source/msg.cpp
index 7d3c35c7b..4b043efb5 100644
--- a/Source/msg.cpp
+++ b/Source/msg.cpp
@@ -957,6 +957,21 @@ void NetSendCmdDamage(BOOL bHiPri, BYTE bPlr, DWORD dwDam)
 		NetSendLoPri((BYTE *)&cmd, sizeof(cmd));
 }
 
+#ifdef HELLFIRE
+void NetSendCmdMonDmg(BOOL bHiPri, WORD wMon, DWORD dwDam)
+{
+	TCmdMonDamage cmd;
+
+	cmd.bCmd = CMD_MONSTDAMAGE;
+	cmd.wMon = wMon;
+	cmd.dwDam = dwDam;
+	if (bHiPri)
+		NetSendHiPri((BYTE *)&cmd, sizeof(cmd));
+	else
+		NetSendLoPri((BYTE *)&cmd, sizeof(cmd));
+}
+#endif
+
 void NetSendCmdString(int pmask, const char *pszStr)
 {
 	int dwStrLen;
diff --git a/Source/msg.h b/Source/msg.h
index 902b4b20b..877a7dbae 100644
--- a/Source/msg.h
+++ b/Source/msg.h
@@ -50,6 +50,9 @@ void NetSendCmdChItem(BOOL bHiPri, BYTE bLoc);
 void NetSendCmdDelItem(BOOL bHiPri, BYTE bLoc);
 void NetSendCmdDItem(BOOL bHiPri, int ii);
 void NetSendCmdDamage(BOOL bHiPri, BYTE bPlr, DWORD dwDam);
+#ifdef HELLFIRE
+void NetSendCmdMonDmg(BOOL bHiPri, WORD bMon, DWORD dwDam);
+#endif
 void NetSendCmdString(int pmask, const char *pszStr);
 void RemovePlrPortal(int pnum);
 DWORD ParseCmd(int pnum, TCmd *pCmd);
diff --git a/structs.h b/structs.h
index bbe56d320..e7f9dd561 100644
--- a/structs.h
+++ b/structs.h
@@ -876,6 +876,14 @@ typedef struct TCmdDamage {
 	DWORD dwDam;
 } TCmdDamage;
 
+#ifdef HELLFIRE
+typedef struct TCmdMonDamage {
+	BYTE bCmd;
+	WORD wMon;
+	DWORD dwDam;
+} TCmdMonDamage;
+#endif
+
 typedef struct TCmdPlrInfoHdr {
 	BYTE bCmd;
 	WORD wOffset;