conf/battle/party.conf |  6 ++++++
 src/map/battle.c       |  1 +
 src/map/battle.h       |  1 +
 src/map/mob.c          |  2 +-
 src/map/quest.c        | 11 ++++++++++-
 5 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/conf/battle/party.conf b/conf/battle/party.conf
index 14d5f47..751e678 100644
--- a/conf/battle/party.conf
+++ b/conf/battle/party.conf
@@ -52,3 +52,9 @@ party_even_share_bonus: 0
 // Display party name regardless if player is in a guild.
 // Official servers do not display party name unless the user is in a guild. (Note 1)
 display_party_name: no
+
+// When killing a questlog monster, allow how much the level gap to add the mob count ?
+// if set to 10, a player with level 50 will add the kill count to all party members from level 40~60 within sight-range
+// if -1, this feature is off, allows all party member within sight-range to add the kill count, regardless of their levels
+// Default : -1 (official)
+party_questkill_level_range: -1
\ No newline at end of file
diff --git a/src/map/battle.c b/src/map/battle.c
index 8930d3a..0b4bb6c 100644
--- a/src/map/battle.c
+++ b/src/map/battle.c
@@ -6774,6 +6774,7 @@ bool battle_check_range(struct block_list *src, struct block_list *bl, int range
 	{ "case_sensitive_aegisnames",          &battle_config.case_sensitive_aegisnames,       1,      0,      1,              },
 	{ "guild_castle_invite",				&battle_config.guild_castle_invite,				0,		0,		1,				},
 	{ "guild_castle_expulsion",				&battle_config.guild_castle_expulsion,			0,		0,		1,				},
+	{ "party_questkill_level_range",		&battle_config.party_questkill_level_range,		-1,		-1,		MAX_LEVEL,		},
 };
 #ifndef STATS_OPT_OUT
 /**
diff --git a/src/map/battle.h b/src/map/battle.h
index 161ddeb..1163d85 100644
--- a/src/map/battle.h
+++ b/src/map/battle.h
@@ -475,6 +475,7 @@ struct Battle_Config {
 	int case_sensitive_aegisnames;
 	int guild_castle_invite;
 	int guild_castle_expulsion;
+	int party_questkill_level_range;
 };
 
 extern struct Battle_Config battle_config;
diff --git a/src/map/mob.c b/src/map/mob.c
index 3f1769d..58e18fa 100644
--- a/src/map/mob.c
+++ b/src/map/mob.c
@@ -2569,7 +2569,7 @@ int mob_dead(struct mob_data *md, struct block_list *src, int type) {
 			}
 
 			if( sd->status.party_id )
-				map->foreachinrange(quest->update_objective_sub,&md->bl,AREA_SIZE,BL_PC,sd->status.party_id,md->class_);
+				map->foreachinrange(quest->update_objective_sub,&md->bl,AREA_SIZE,BL_PC,sd->status.party_id,md->class_,sd->status.base_level);
 			else if( sd->avail_quests )
 				quest->update_objective(sd, md->class_);
 
diff --git a/src/map/quest.c b/src/map/quest.c
index b76d6bc..dbf7a00 100644
--- a/src/map/quest.c
+++ b/src/map/quest.c
@@ -224,19 +224,28 @@ int quest_delete(TBL_PC *sd, int quest_id) {
  */
 int quest_update_objective_sub(struct block_list *bl, va_list ap) {
 	struct map_session_data *sd;
-	int mob_id, party_id;
+	int mob_id, party_id, baselevel, range;
 
 	nullpo_ret(bl);
 	nullpo_ret(sd = (struct map_session_data *)bl);
 
 	party_id = va_arg(ap,int);
 	mob_id = va_arg(ap,int);
+	baselevel = va_arg(ap,int);
 
 	if( !sd->avail_quests )
 		return 0;
 	if( sd->status.party_id != party_id )
 		return 0;
 
+	if ( battle_config.party_questkill_level_range != -1 ) {
+		range = sd->status.base_level - baselevel;
+		if ( range < 0 )
+			range = -range;
+		if ( range > battle_config.party_questkill_level_range )
+			return 0;
+	}
+
 	quest->update_objective(sd, mob_id);
 
 	return 1;