diff --git a/src/Combat.cpp b/src/Combat.cpp
index 391a267..1320be7 100644
--- a/src/Combat.cpp
+++ b/src/Combat.cpp
@@ -217,6 +217,30 @@ int Combat::hitMob(CNSocket *sock, Mob *mob, int damage) {
     return damage;
 }
 
+/*
+ * When a group of players is doing missions together, we want them to all get
+ * quest items at the same time, but we don't want the odds of quest item
+ * drops from different missions to be linked together. That's why we use a
+ * single RNG roll per mission task, and every group member shares that same
+ * set of rolls.
+ */
+static void genQItemRolls(Player *leader, std::map<int, int>& rolls) {
+    for (int i = 0; i < leader->groupCnt; i++) {
+        if (leader->groupIDs[i] == 0)
+            continue;
+
+        CNSocket *otherSock = PlayerManager::getSockFromID(leader->groupIDs[i]);
+        if (otherSock == nullptr)
+            continue;
+
+        Player *member = PlayerManager::getPlayer(otherSock);
+
+        for (int j = 0; j < ACTIVE_MISSION_COUNT; j++)
+            if (member->tasks[j] != 0)
+                rolls[member->tasks[j]] = Rand::rand();
+    }
+}
+
 void Combat::killMob(CNSocket *sock, Mob *mob) {
     mob->state = MobState::DEAD;
     mob->target = nullptr;
@@ -231,19 +255,19 @@ void Combat::killMob(CNSocket *sock, Mob *mob) {
 
         Items::DropRoll rolled;
         Items::DropRoll eventRolled;
-        int rolledQItem = Rand::rand();
+        std::map<int, int> qitemRolls;
+
+        Player *leader = PlayerManager::getPlayerFromID(plr->iIDGroup);
+        assert(leader != nullptr); // should never happen
+
+        genQItemRolls(leader, qitemRolls);
 
         if (plr->groupCnt == 1 && plr->iIDGroup == plr->iID) {
             Items::giveMobDrop(sock, mob, rolled, eventRolled);
-            Missions::mobKilled(sock, mob->appearanceData.iNPCType, rolledQItem);
+            Missions::mobKilled(sock, mob->appearanceData.iNPCType, qitemRolls);
         } else {
-            Player* otherPlayer = PlayerManager::getPlayerFromID(plr->iIDGroup);
-
-            if (otherPlayer == nullptr)
-                return;
-
-            for (int i = 0; i < otherPlayer->groupCnt; i++) {
-                CNSocket* sockTo = PlayerManager::getSockFromID(otherPlayer->groupIDs[i]);
+            for (int i = 0; i < leader->groupCnt; i++) {
+                CNSocket* sockTo = PlayerManager::getSockFromID(leader->groupIDs[i]);
                 if (sockTo == nullptr)
                     continue;
 
@@ -255,7 +279,7 @@ void Combat::killMob(CNSocket *sock, Mob *mob) {
                     continue;
 
                 Items::giveMobDrop(sockTo, mob, rolled, eventRolled);
-                Missions::mobKilled(sockTo, mob->appearanceData.iNPCType, rolledQItem);
+                Missions::mobKilled(sockTo, mob->appearanceData.iNPCType, qitemRolls);
             }
         }
     }
@@ -379,7 +403,7 @@ static void pcAttackChars(CNSocket *sock, CNPacketData *data) {
     sP_CL2FE_REQ_PC_ATTACK_CHARs* pkt = (sP_CL2FE_REQ_PC_ATTACK_CHARs*)data->buf;
     Player *plr = PlayerManager::getPlayer(sock);
 
-    // only GMs can use this this variant
+    // only GMs can use this variant
     if (plr->accountLevel > 30)
         return;
 
diff --git a/src/Missions.cpp b/src/Missions.cpp
index 8e05479..9d2dd69 100644
--- a/src/Missions.cpp
+++ b/src/Missions.cpp
@@ -567,7 +567,7 @@ void Missions::updateFusionMatter(CNSocket* sock, int fusion) {
     PlayerManager::sendToViewable(sock, (void*)&bcast, P_FE2CL_PC_EVENT, sizeof(sP_FE2CL_PC_EVENT));
 }
 
-void Missions::mobKilled(CNSocket *sock, int mobid, int rolledQItem) {
+void Missions::mobKilled(CNSocket *sock, int mobid, std::map<int, int>& rolls) {
     Player *plr = PlayerManager::getPlayer(sock);
 
     bool missionmob = false;
@@ -593,7 +593,7 @@ void Missions::mobKilled(CNSocket *sock, int mobid, int rolledQItem) {
 
             // drop quest item
             if (task["m_iCSUItemNumNeeded"][j] != 0 && !isQuestItemFull(sock, task["m_iCSUItemID"][j], task["m_iCSUItemNumNeeded"][j]) ) {
-                bool drop = rolledQItem % 100 < task["m_iSTItemDropRate"][j];
+                bool drop = rolls[plr->tasks[i]] % 100 < task["m_iSTItemDropRate"][j];
                 if (drop) {
                     dropQuestItem(sock, plr->tasks[i], 1, task["m_iCSUItemID"][j], mobid);
 
diff --git a/src/Missions.hpp b/src/Missions.hpp
index acaf223..4e572a6 100644
--- a/src/Missions.hpp
+++ b/src/Missions.hpp
@@ -47,7 +47,7 @@ namespace Missions {
     // checks if player doesn't have n/n quest items
     void updateFusionMatter(CNSocket* sock, int fusion);
 
-    void mobKilled(CNSocket *sock, int mobid, int rolledQItem);
+    void mobKilled(CNSocket *sock, int mobid, std::map<int, int>& rolls);
 
     void quitTask(CNSocket* sock, int32_t taskNum, bool manual);