diff --git a/npc/battleground/flavius/flavius01.txt b/npc/battleground/flavius/flavius01.txt
index fa726e3f38..aa45e4a5f6 100644
--- a/npc/battleground/flavius/flavius01.txt
+++ b/npc/battleground/flavius/flavius01.txt
@@ -3,7 +3,7 @@
 //===== By: ================================================== 
 //= L0ne_W0lf
 //===== Current Version: ===================================== 
-//= 1.6
+//= 1.7
 //===== Compatible With: ===================================== 
 //= rAthena Project
 //===== Description: ========================================= 
@@ -19,6 +19,7 @@
 //= 1.4 Label standardization. [Euphy]
 //= 1.5 Added GM management function. [Euphy]
 //= 1.6 Added VIP features and created a reward function. [Euphy]
+//= 1.7 Made Crystals immune to attacks until Guardians are defeated. [Cydh/Aleos]
 //============================================================
 
 // Waiting Room NPCs
@@ -152,7 +153,8 @@ OnTimer10000:
 
 bat_b01,1,1,3	script	OBJ#bat_b01_a	844,{
 OnEnable:
-	bg_monster $@FlaviusBG1_id1,"bat_b01",61,150,"Pink Crystal",1915,"OBJ#bat_b01_a::OnMyMobDead";
+	$@FlavBG1_C1_ID = bg_monster $@FlaviusBG1_id1,"bat_b01",61,150,"Pink Crystal",1915,"OBJ#bat_b01_a::OnMyMobDead";
+	setunitdata $@FlavBG1_C1_ID,31,1; // Make Crystal immune to damage until Guardians are defeated
 	end;
 
 OnKill:
@@ -185,7 +187,8 @@ OnMyMobDead:
 
 bat_b01,1,2,3	script	OBJ#bat_b01_b	844,{
 OnEnable:
-	bg_monster $@FlaviusBG1_id2,"bat_b01",328,150,"Blue Crystal",1914,"OBJ#bat_b01_b::OnMyMobDead";
+	$@FlavBG1_C2_ID = bg_monster $@FlaviusBG1_id2,"bat_b01",328,150,"Blue Crystal",1914,"OBJ#bat_b01_b::OnMyMobDead";
+	setunitdata $@FlavBG1_C2_ID,31,1; // Make Crystal immune to damage until Guardians are defeated
 	end;
 
 OnKill:
@@ -230,6 +233,7 @@ OnMyMobDead:
 	if (mobcount("bat_b01","guardian#bat_b01_a::OnMyMobDead") < 1) {
 		donpcevent "cell#bat_b01_a::OnGreen";
 		mapannounce "bat_b01", "The Guardian protecting Guillaume's Crystal has been slain.",bc_map,"0xFFCE00";
+		setunitdata $@FlavBG1_C1_ID,31,0; // Make Crystal damageable again
 	}
 	end;
 }
@@ -248,6 +252,7 @@ OnMyMobDead:
 	if (mobcount("bat_b01","guardian#bat_b01_b::OnMyMobDead") < 1) {
 		donpcevent "cell#bat_b01_b::OnGreen";
 		mapannounce "bat_b01", "The Guardian protecting Croix's Crystal has been slain.",bc_map,"0xFFCE00";
+		setunitdata $@FlavBG1_C2_ID,31,0; // Make Crystal damageable again
 	}
 	end;
 }
diff --git a/npc/battleground/flavius/flavius02.txt b/npc/battleground/flavius/flavius02.txt
index 01ff680e4d..5c266548d0 100644
--- a/npc/battleground/flavius/flavius02.txt
+++ b/npc/battleground/flavius/flavius02.txt
@@ -3,7 +3,7 @@
 //===== By: ================================================== 
 //= L0ne_W0lf
 //===== Current Version: ===================================== 
-//= 1.7
+//= 1.8
 //===== Compatible With: ===================================== 
 //= rAthena Project
 //===== Description: ========================================= 
@@ -20,6 +20,7 @@
 //= 1.5 Label standardization. [Euphy]
 //= 1.6 Added GM management function. [Euphy]
 //= 1.7 Added VIP features and created a reward function. [Euphy]
+//= 1.8 Made Crystals immune to attacks until Guardians are defeated. [Cydh/Aleos]
 //============================================================
 
 // Waiting Room NPCs
@@ -153,7 +154,8 @@ OnTimer10000:
 
 bat_b02,1,1,3	script	OBJ#bat_b02_a	844,{
 OnEnable:
-	bg_monster $@FlaviusBG2_id1,"bat_b02",61,150,"Pink Crystal",1915,"OBJ#bat_b02_a::OnMyMobDead";
+	$@FlavBG2_C1_ID = bg_monster $@FlaviusBG2_id1,"bat_b02",61,150,"Pink Crystal",1915,"OBJ#bat_b02_a::OnMyMobDead";
+	setunitdata $@FlavBG2_C1_ID,31,1; // Make Crystal immune to damage until Guardians are defeated
 	end;
 
 OnKill:
@@ -186,7 +188,8 @@ OnMyMobDead:
 
 bat_b02,1,2,3	script	OBJ#bat_b02_b	844,{
 OnEnable:
-	bg_monster $@FlaviusBG2_id2,"bat_b02",328,150,"Blue Crystal",1914,"OBJ#bat_b02_b::OnMyMobDead";
+	$@FlavBG2_C2_ID = bg_monster $@FlaviusBG2_id2,"bat_b02",328,150,"Blue Crystal",1914,"OBJ#bat_b02_b::OnMyMobDead";
+	setunitdata $@FlavBG2_C2_ID,31,1; // Make Crystal immune to damage until Guardians are defeated
 	end;
 
 OnKill:
@@ -231,6 +234,7 @@ OnMyMobDead:
 	if (mobcount("bat_b02","guardian#bat_b02_a::OnMyMobDead") < 1) {
 		donpcevent "cell#bat_b02_a::OnGreen";
 		mapannounce "bat_b02", "The Guardian protecting Guillaume's Crystal has been slain.",bc_map,"0xFFCE00";
+		setunitdata $@FlavBG2_C1_ID,31,0; // Make Crystal damageable again
 	}
 	end;
 }
@@ -249,6 +253,7 @@ OnMyMobDead:
 	if (mobcount("bat_b02","guardian#bat_b02_b::OnMyMobDead") < 1) {
 		donpcevent "cell#bat_b02_b::OnGreen";
 		mapannounce "bat_b02", "The Guardian protecting Croix's Crystal has been slain.",bc_map,"0xFFCE00";
+		setunitdata $@FlavBG2_C2_ID,31,0; // Make Crystal damageable again
 	}
 	end;
 }