diff --git a/server/gameserver/creature.cc b/server/gameserver/creature.cc
index a640828f..fbb4fb6b 100644
--- a/server/gameserver/creature.cc
+++ b/server/gameserver/creature.cc
@@ -1779,6 +1779,15 @@ void Creature::CheckSpecObject(int new_poly_flags)
                                      {
                                          if (a8::TIMER_EXEC_EVENT == event) {
                                              if (!dead) {
+                                                 float dmg = GetMaxHP() * mt::Param::s().magma_dec_hp_rate;
+                                                 float dmg_out = 0.0f;
+                                                 DecHP(dmg, VP_Magma,
+                                                       TEXT("battle_server_killer_magma", "magma"), VW_Magma,
+                                                       VP_Magma,
+                                                       TEXT("battle_server_killer_magma", "magma"),
+                                                       dmg_out,
+                                                       0,
+                                                       0);
                                              }
                                          }
                                      },
diff --git a/server/gameserver/mt/Param.cc b/server/gameserver/mt/Param.cc
index edf1f207..b83a2b59 100644
--- a/server/gameserver/mt/Param.cc
+++ b/server/gameserver/mt/Param.cc
@@ -61,6 +61,8 @@ namespace mt
             s_.battle_gain_exp_rate_killer = GetFloatParam("battle_gain_exp_rate_killer", 0.5);
             s_.battle_gain_exp_rate_teammate = GetFloatParam("battle_gain_exp_rate_teammate", 0.3);
 
+            s_.magma_dec_hp_rate = GetFloatParam("magma_dec_hp_rate", 0.1);
+
 #ifdef MYDEBUG1
             s_.moba_room_time = 60;
             s_.moba_kill_times = GetIntParam("moba_kill_times", 1);
diff --git a/server/gameserver/mt/Param.h b/server/gameserver/mt/Param.h
index 8049290f..40cd5dff 100644
--- a/server/gameserver/mt/Param.h
+++ b/server/gameserver/mt/Param.h
@@ -147,6 +147,7 @@ namespace mt
         int battling_grass_hide_delay_time = 0;
 
         int frag_dinshen_time = 1200;
+        float magma_dec_hp_rate = 0.1;
 
         std::vector<float> block_effect_range;
         std::vector<float> crit_effect_range;