diff --git a/server/gameserver/buff.cc b/server/gameserver/buff.cc
index 27f4911..91358f5 100644
--- a/server/gameserver/buff.cc
+++ b/server/gameserver/buff.cc
@@ -29,7 +29,10 @@ void Buff::ProcLastBurn(const a8::XParams& param)
     Human* hum = (Human*)param.sender.GetUserData();
     Buff* buff = (Buff*)param.param1.GetUserData();
     if (!hum->dead && !hum->HasBuffEffect(BET_Invincible)) {
-        hum->DecHP(buff->meta->param1,
+        float power = buff->meta->param1;
+        float def = hum->ability.def;
+        float finally_dmg = power * (1 - def/MetaMgr::Instance()->K);
+        hum->DecHP(finally_dmg,
                    hum->last_attacker_id,
                    hum->last_attacker_name,
                    hum->last_attacker_weapon_id);
@@ -70,8 +73,11 @@ void Buff::ProcReleaseFireBomb(const a8::XParams& param)
             for (Human* hum : cell->human_list) {
                 if (hum != sender && !hum->dead && !hum->HasBuffEffect(BET_Invincible)) {
                     if (hum->TestCollision(&collider)) {
+                        float power = buff->meta->param4 + sender->ability.atk;
+                        float def = hum->ability.def;
+                        float finally_dmg = power * (1 - def/MetaMgr::Instance()->K);
                         hum->DecHP(
-                                   buff->meta->param4,
+                                   finally_dmg,
                                    sender->entity_uniid,
                                    sender->name,
                                    0
diff --git a/server/gameserver/bullet.cc b/server/gameserver/bullet.cc
index 840816f..689733a 100644
--- a/server/gameserver/bullet.cc
+++ b/server/gameserver/bullet.cc
@@ -58,15 +58,15 @@ void Bullet::OnHit(std::set<Entity*>& objects)
                 if (!hum->dead) {
 #else
                 if (hum != player && !hum->dead &&
-                    (hum->team_id == 0 || player->team_id != hum->team_id)) {
+                    (hum->team_id == 0 || master->team_id != hum->team_id)) {
 #endif
-                    float dmg = meta->i->atk() * (1 + player->ability.damage_add);
-                    float def = hum->ability.def + hum->ability.def_add;
-                    float finaly_dmg = dmg * (1 - def/MetaMgr::Instance()->K);
-                    player->stats.damage_amount_out += finaly_dmg;
+                    float power = meta->i->atk() + master->ability.atk;
+                    float def = hum->ability.def;
+                    float finaly_dmg = power * (1 - def/MetaMgr::Instance()->K);
+                    master->stats.damage_amount_out += finaly_dmg;
                     hum->OnHit();
                     if (!hum->HasBuffEffect(BET_Invincible)) {
-                        hum->DecHP(finaly_dmg, player->entity_uniid, player->name, meta->i->id());
+                        hum->DecHP(finaly_dmg, master->entity_uniid, master->name, meta->i->id());
                     }
                 }
             }
@@ -75,11 +75,11 @@ void Bullet::OnHit(std::set<Entity*>& objects)
             {
                 Obstacle* obstacle = (Obstacle*)target;
                 if (!obstacle->dead && obstacle->meta->i->attack_type() == 1) {
-                    float dmg = meta->i->atk() * (1 + player->ability.damage_add);
+                    float dmg = meta->i->atk() + master->ability.atk;
                     float def = 0;
                     float finaly_dmg = dmg * (1 - def/MetaMgr::Instance()->K);
                     #if 0
-                    player->stats.damage_amount_out += finaly_dmg;
+                    master->stats.damage_amount_out += finaly_dmg;
                     #endif
 
                     obstacle->health = std::max(0.0f, obstacle->health - finaly_dmg);
@@ -154,8 +154,8 @@ void Bullet::MapServiceUpdate()
         std::set<Entity*> objects;
         for (auto& grid : grid_list) {
             for (Human* hum: grid->human_list) {
-                if (hum != player && !hum->dead &&
-                    (hum->team_id == 0 || player->team_id != hum->team_id)) {
+                if (hum != master && !hum->dead &&
+                    (hum->team_id == 0 || master->team_id != hum->team_id)) {
                     if (TestCollision(hum)) {
                         objects.insert(hum);
                     }
@@ -207,7 +207,10 @@ void Bullet::PostAttack()
                     if (hum->pos.Distance(obstacle->pos) < obstacle->meta->i->damage_dia()) {
                         hum->OnHit();
                         if (!hum->HasBuffEffect(BET_Invincible)) {
-                            hum->DecHP(obstacle->meta->i->damage(), sender->entity_uniid, sender->name, 0);
+                            float power = obstacle->meta->i->damage() + sender->ability.atk;
+                            float def = hum->ability.def;
+                            float finally_dmg = power * (1 - def/MetaMgr::Instance()->K);
+                            hum->DecHP(finally_dmg, sender->entity_uniid, sender->name, 0);
                         }
                     }
                 }
@@ -221,7 +224,7 @@ void Bullet::PostAttack()
             room->xtimer.AddDeadLineTimerAndAttach(SERVER_FRAME_RATE,
                                                    a8::XParams()
                                                    .SetSender(obstacle)
-                                                   .SetParam1(player),
+                                                   .SetParam1(master),
                                                    fire_func,
                                                    &obstacle->xtimer_attacher.timer_list_);
             room->xtimer.AddDeadLineTimerAndAttach(meta->i->time() * SERVER_FRAME_RATE,
@@ -250,7 +253,10 @@ void Bullet::ProcMissible(const a8::XParams& param)
                 if (src_pos.Distance(target->pos) < bullet_meta->i->range()) {
                     target->OnHit();
                     if (!target->HasBuffEffect(BET_Invincible)) {
-                        target->DecHP(bullet_meta->i->atk(),
+                        float power = bullet_meta->i->atk() + sender->ability.atk;
+                        float def = target->ability.def;
+                        float finally_dmg = power * (1 - def/MetaMgr::Instance()->K);
+                        target->DecHP(finally_dmg,
                                       sender->entity_uniid,
                                       sender->name,
                                       bullet_meta->i->id()
@@ -260,7 +266,10 @@ void Bullet::ProcMissible(const a8::XParams& param)
             } else {
                 target->OnHit();
                 if (!target->HasBuffEffect(BET_Invincible)) {
-                    target->DecHP(bullet_meta->i->atk(),
+                    float power = bullet_meta->i->atk() + sender->ability.atk;
+                    float def = target->ability.def;
+                    float finally_dmg = power * (1 - def/MetaMgr::Instance()->K);
+                    target->DecHP(finally_dmg,
                                   sender->entity_uniid,
                                   sender->name,
                                   bullet_meta->i->id()
diff --git a/server/gameserver/bullet.h b/server/gameserver/bullet.h
index cdb5f68..173d29d 100644
--- a/server/gameserver/bullet.h
+++ b/server/gameserver/bullet.h
@@ -16,7 +16,7 @@ class Bullet : public Entity
 {
  public:
     MetaData::Equip* meta = nullptr;
-    Human* player = nullptr;
+    Human* master = nullptr;
     a8::Vec2 dir;
     a8::Vec2 born_pos;
     a8::Vec2 born_dir;
diff --git a/server/gameserver/frameevent.cc b/server/gameserver/frameevent.cc
index 7218655..fbbac4c 100644
--- a/server/gameserver/frameevent.cc
+++ b/server/gameserver/frameevent.cc
@@ -123,16 +123,16 @@ void FrameEvent::AddSmoke(Bullet* bullet, int item_id, a8::Vec2 pos)
 {
     {
         auto& tuple = a8::FastAppend(smokes_);
-        std::get<0>(tuple) = bullet->player;
+        std::get<0>(tuple) = bullet->master;
         auto& p = std::get<1>(tuple);
 
         p.set_item_id(item_id);
         TypeConvert::ToPb(pos, p.mutable_pos());
-        p.set_player_id(bullet->player->entity_uniid);
+        p.set_player_id(bullet->master->entity_uniid);
     }
     {
         int idx = smokes_.size() - 1;
-        for (auto& cell : bullet->player->grid_list) {
+        for (auto& cell : bullet->master->grid_list) {
             for (auto& hum : cell->human_list) {
                 hum->smokes_.push_back(idx);
             }
diff --git a/server/gameserver/human.cc b/server/gameserver/human.cc
index 58cb7a7..4d81bec 100644
--- a/server/gameserver/human.cc
+++ b/server/gameserver/human.cc
@@ -1635,7 +1635,10 @@ void Human::_UpdateAssaultMove()
                 for (Human* hum : cell->human_list) {
                     if (hum->team_id != team_id && hum->pos.Distance(skill_target_pos) < hum->GetRadius()) {
                         if (!hum->HasBuffEffect(BET_Invincible)) {
-                            hum->DecHP(phase->param1.GetDouble(), entity_uniid, name, 0);
+                            float power = phase->param1.GetDouble() + ability.atk;
+                            float def = hum->ability.def;
+                            float finally_dmg = power * (1 - def/MetaMgr::Instance()->K);
+                            hum->DecHP(finally_dmg, entity_uniid, name, 0);
                             target_list.insert(hum);
                         }
                         a8::Vec2 pull_dir = skill_dir;
@@ -1908,32 +1911,6 @@ void Human::ProcSkillPhase(MetaData::SkillPhase* phase)
     switch (phase->func_id) {
     case Skill_Jump:
         {
-            #if 0
-            a8::Vec2 old_pos = pos;
-            pos = skill_target_pos;
-            if (IsCollisionInMapService()) {
-                pos = old_pos;
-            } else {
-                for (auto& cell : grid_list) {
-                    for (Human* hum : cell->human_list) {
-                        if (hum->team_id != team_id && hum->pos.Distance(skill_target_pos) < hum->GetRadius()) {
-                            if (!hum->HasBuffEffect(BET_Invincible)) {
-                                hum->DecHP(phase->param1.GetDouble(), entity_uniid, name, 0);
-                            }
-                            a8::Vec2 pull_dir = pos - old_pos;
-                            if (std::abs(pull_dir.x) > FLT_EPSILON ||
-                                std::abs(pull_dir.y) > FLT_EPSILON) {
-                                pull_dir.Normalize();
-                                hum->PullHuman(pull_dir, phase->param2.GetDouble());
-                            }
-                        }
-                    }
-                }
-                room->frame_event.AddExplosion(0, pos, 2);
-                room->grid_service.MoveHuman(this);
-                CheckGrass();
-            }
-            #endif
         }
         break;
     case Skill_Shot:
diff --git a/server/gameserver/obstacle.cc b/server/gameserver/obstacle.cc
index d7dbff4..7504ebf 100644
--- a/server/gameserver/obstacle.cc
+++ b/server/gameserver/obstacle.cc
@@ -205,7 +205,10 @@ void Obstacle::Explosion()
                     Human* hum = (Human*)target;
                     if (!hum->dead && hum != master) {
                         float dmg = meta->i->damage();
-                        float def = hum->ability.def + hum->ability.def_add;
+                        if (master) {
+                            dmg += master->ability.atk;
+                        }
+                        float def = hum->ability.def;
                         float finaly_dmg = dmg * (1 - def/MetaMgr::Instance()->K);
                         hum->OnHit();
                         if (!hum->HasBuffEffect(BET_Invincible)) {
diff --git a/server/gameserver/room.cc b/server/gameserver/room.cc
index 70703ab..48d5bb7 100644
--- a/server/gameserver/room.cc
+++ b/server/gameserver/room.cc
@@ -556,7 +556,7 @@ void Room::CreateBullet(Human* hum, MetaData::Equip* bullet_meta,
                         a8::Vec2 pos, a8::Vec2 dir, float fly_distance)
 {
     Bullet* bullet = new Bullet();
-    bullet->player = hum;
+    bullet->master = hum;
     bullet->room = this;
     bullet->meta = bullet_meta;
     bullet->pos = pos;
diff --git a/server/gameserver/types.h b/server/gameserver/types.h
index c5adebf..9c5b777 100755
--- a/server/gameserver/types.h
+++ b/server/gameserver/types.h
@@ -103,9 +103,6 @@ struct HumanAbility
     float atk = 0.0f;
     float def = 0.0f;
     float speed = 0.0f;
-    float damage_add = 0.0f;
-    float def_add = 0.0f;
-    float reflect_damage = 0.0f;
 
     float shot_range = 0.0f;
     float shot_speed = 0.0f;