diff --git a/scenes/main/combat_s2.gd b/scenes/main/combat_s2.gd
index 1c08db8..1013ef2 100644
--- a/scenes/main/combat_s2.gd
+++ b/scenes/main/combat_s2.gd
@@ -13,6 +13,7 @@ var _enemy_mm:  MultiMesh = null
 ## UI 层引用
 var _hud_layer:    CanvasLayer = null
 var _shop_layer:   CanvasLayer = null
+var _shop_warn:    Label       = null   # 防呆警告：Deck 无 ACTION 时提示
 
 ## HUD 标签
 var _lbl_wave:    Label = null
@@ -304,6 +305,12 @@ func _setup_shop_ui() -> void:
 	_close_btn.connect("pressed", _on_close_shop_pressed)
 	_shop_layer.add_child(_close_btn)
 
+	_shop_warn = Label.new()
+	_shop_warn.position = Vector2(120, 448)
+	_shop_warn.add_theme_color_override("font_color", Color(1.0, 0.45, 0.35))
+	_shop_warn.visible = false
+	_shop_layer.add_child(_shop_warn)
+
 # ── HUD 刷新 ────────────────────────────────────────────────
 
 func _refresh_hud() -> void:
@@ -348,6 +355,8 @@ func _on_stats_changed() -> void:
 		_refresh_shop_ui()
 
 func _on_shop_ready(_wave: int) -> void:
+	if _shop_warn:
+		_shop_warn.visible = false
 	_shop_layer.visible = true
 	_refresh_shop_ui()
 
@@ -662,6 +671,11 @@ func _on_inv_bench_pressed(bi: int) -> void:
 	_rebuild_inventory()
 
 func _on_close_shop_pressed() -> void:
+	# 防呆：Deck 无 ACTION 法术则法术塔无法开火，阻止进入战斗并提示
+	if not _cm.has_castable_action():
+		_shop_warn.text = tr("SHOP_NEED_ACTION")
+		_shop_warn.visible = true
+		return
 	_shop_layer.visible = false
 	_cm.close_shop_and_next_wave()
 
diff --git a/scripts/autoloads/core_feature_tag.gd b/scripts/autoloads/core_feature_tag.gd
index 2687cef..94b0e2b 100644
--- a/scripts/autoloads/core_feature_tag.gd
+++ b/scripts/autoloads/core_feature_tag.gd
@@ -1,7 +1,15 @@
-## CoreFeatureTag — Core 特性标签整数常量（Autoload: CoreFeatureTag）
+## CoreFeatureTag — Core 特性标签枚举常量（Autoload: CoreFeatureTag）
 ## 禁止在判断逻辑中使用裸字符串（跨切片约束 ADR-R5-N2）。
+##
+## feature_tags 当前为**单选枚举值**（一个 Core 至多一个特性）：游戏设计器
+## core_tab.gd 以 OptionButton 下标 0..5 写入（0=无），下标即等于下列常量值。
+## ⚠️ 因此判定必须用 `==`（相等），**不能用位与 `&`**——常量值非 2 的幂，
+## `&` 会串扰（如 ALWAYS_CAST_LAST(3) & PERSISTENT_MEMORY(1) = 1 误判持久内存）。
+## 若将来需要一个 Core 同时携带多个特性，应改为 2 的幂位标志 + 设计器多选，
+## 并把所有判定改回 `& X != 0`。
 extends Node
 
+const NONE:               int = 0  # 无特性（OptionButton 下标 0）
 const PERSISTENT_MEMORY: int = 1  # 寄存器跨帧保留（wand_memory Core）
 const DUAL_STREAM:        int = 2  # 双流执行（P6-N12，S6 P1 实现）
 const ALWAYS_CAST_LAST:   int = 3  # 尾槽 MODIFIER/TRIGGER/LOGIC 静默跳过（P6-N7）
diff --git a/scripts/domain/combat/combat_manager.gd b/scripts/domain/combat/combat_manager.gd
index bb63b50..e085c00 100644
--- a/scripts/domain/combat/combat_manager.gd
+++ b/scripts/domain/combat/combat_manager.gd
@@ -284,5 +284,15 @@ func apply_wand_save_data(d: Dictionary) -> void:
 func get_deck_spell_ids() -> Array:
 	return _deck_spell_ids
 
+## 防呆校验：Deck 是否含至少一个 ACTION 法术（否则法术塔无法开火，见 game_design §5.1 G5 防呆机制）
+func has_castable_action() -> bool:
+	for sid in _deck_spell_ids:
+		if String(sid) == "":
+			continue
+		var sn: SpellNode = SpellRegistry.get_spell(sid)
+		if sn != null and sn.type == SpellNode.SpellType.ACTION:
+			return true
+	return false
+
 func get_equipped_compiled() -> CompiledDeck:
 	return _equipped_compiled
diff --git a/scripts/domain/spell_system/cast_stats.gd b/scripts/domain/spell_system/cast_stats.gd
index 0b99703..13d2bb5 100644
--- a/scripts/domain/spell_system/cast_stats.gd
+++ b/scripts/domain/spell_system/cast_stats.gd
@@ -11,6 +11,7 @@ var lifetime:         float = 0.0   # 对默认 lifetime 的差値（<0 缩短
 var speed_mult:       float = 1.0   # 弹速倍率
 var radius_mult:      float = 1.0   # 弹体半径倍率
 var crit_chance:      float = 0.0   # 暴击概率
+var pierce_add:       int   = 0     # MODIFIER 累加的穿透次数（叠加到 ACTION 自带 pierce）
 
 func reset() -> void:
 	damage_add      = 0.0
@@ -21,3 +22,4 @@ func reset() -> void:
 	speed_mult      = 1.0
 	radius_mult     = 1.0
 	crit_chance     = 0.0
+	pierce_add      = 0
diff --git a/scripts/domain/spell_system/spell_evaluator.gd b/scripts/domain/spell_system/spell_evaluator.gd
index 3befeea..e764e92 100644
--- a/scripts/domain/spell_system/spell_evaluator.gd
+++ b/scripts/domain/spell_system/spell_evaluator.gd
@@ -38,7 +38,7 @@ func compile_wand(core: CoreDefinition, raw_nodes: Array) -> CompiledDeck:
 	_persistent_ctx.clear()  # 换杖/重编译即重置跨帧寄存器记忆
 	# P6-N3 修复：若 Core 带 PERSISTENT_MEMORY，在非热路径的 compile_wand 阶段预分配 SpellContext，
 	# 避免首次施法时在 _physics_process 热路径内 SpellContext.new()
-	if (core.feature_tags & CoreFeatureTag.PERSISTENT_MEMORY) != 0:
+	if core.feature_tags == CoreFeatureTag.PERSISTENT_MEMORY:
 		var prewarm := SpellContext.new()
 		prewarm.caster_id = 0           # 玩家 caster_id，下次 acquire 时覆写
 		_persistent_ctx[0] = prewarm    # 预热 id=0（玩家唯一 id）
@@ -321,7 +321,7 @@ func _node_has_tag(node: SpellNode, tag_pattern: String) -> bool:
 func execute_compiled(compiled: CompiledDeck, caster_id: int, spawn_pos: Vector2) -> void:
 	if compiled == null or compiled.is_empty():
 		return
-	var persistent: bool = (compiled.feature_tags & CoreFeatureTag.PERSISTENT_MEMORY) != 0
+	var persistent: bool = compiled.feature_tags == CoreFeatureTag.PERSISTENT_MEMORY
 	var ctx: SpellContext = _acquire_ctx(caster_id, persistent)
 	var deck: SpellDeck   = compiled.make_runtime_deck()
 	var ops_count:         int = 0
@@ -417,7 +417,7 @@ func _push_projectile(node: SpellNode, ctx: SpellContext, spawn_pos: Vector2, tr
 		var vel:        Vector2 = aim_dir.rotated(angle_offset) * speed * ctx.stats.speed_mult
 		var actual_dmg: float   = (base_dmg + ctx.stats.damage_add) * ctx.stats.damage_mult
 		var actual_r:   float   = radius * ctx.stats.radius_mult
-		var pierce:     int     = int(meta.get("pierce", 0))
+		var pierce:     int     = int(meta.get("pierce", 0)) + ctx.stats.pierce_add
 		var cold: Dictionary = {}
 		if pierce > 0:
 			cold["pierce_remaining"] = pierce
@@ -499,6 +499,8 @@ func _apply_modifier(node: SpellNode, ctx: SpellContext) -> void:
 		ctx.stats.lifetime      += float(meta["lifetime_add"])
 	if meta.has("multicast"):
 		ctx.stats.multicast_count += int(meta["multicast"])
+	if meta.has("pierce"):
+		ctx.stats.pierce_add    += int(meta["pierce"])
 
 ## ── 上下文获取（区分跨帧持久 / 池化）─────────────────────────
 func _acquire_ctx(caster_id: int, persistent: bool) -> SpellContext:
diff --git a/translations/en.po b/translations/en.po
index 40e318b..1b9ee42 100644
--- a/translations/en.po
+++ b/translations/en.po
@@ -39,6 +39,9 @@ msgstr "Reroll (%dG)"
 msgid "SHOP_NEXT_WAVE"
 msgstr "Next Wave"
 
+msgid "SHOP_NEED_ACTION"
+msgstr "Tower can't fire! Add at least one ACTION spell."
+
 msgid "SHOP_CORE_BTN"
 msgstr "Wand: %s ⟳"
 
diff --git a/translations/ja.po b/translations/ja.po
index 99862d7..9b41cd3 100644
--- a/translations/ja.po
+++ b/translations/ja.po
@@ -39,6 +39,9 @@ msgstr "リロール (%dG)"
 msgid "SHOP_NEXT_WAVE"
 msgstr "次のウェーブへ"
 
+msgid "SHOP_NEED_ACTION"
+msgstr "呪文塔が発射できません！ACTION 呪文を1つ以上入れてください。"
+
 msgid "SHOP_CORE_BTN"
 msgstr "杖: %s ⟳"
 
diff --git a/translations/zh_CN.po b/translations/zh_CN.po
index 50ba7f4..2100036 100644
--- a/translations/zh_CN.po
+++ b/translations/zh_CN.po
@@ -39,6 +39,9 @@ msgstr "刷新 (%dG)"
 msgid "SHOP_NEXT_WAVE"
 msgstr "出发下一波"
 
+msgid "SHOP_NEED_ACTION"
+msgstr "法术塔无法开火！需要至少一个行动类(ACTION)法术。"
+
 msgid "SHOP_CORE_BTN"
 msgstr "法杖: %s ⟳"
 
diff --git a/translations/zh_TW.po b/translations/zh_TW.po
index c8d0209..a5390e2 100644
--- a/translations/zh_TW.po
+++ b/translations/zh_TW.po
@@ -39,6 +39,9 @@ msgstr "刷新 (%dG)"
 msgid "SHOP_NEXT_WAVE"
 msgstr "出發下一波"
 
+msgid "SHOP_NEED_ACTION"
+msgstr "法術塔無法開火！需要至少一個行動類(ACTION)法術。"
+
 msgid "SHOP_CORE_BTN"
 msgstr "法杖: %s ⟳"