diff --git a/crawl-ref/source/art-data.txt b/crawl-ref/source/art-data.txt
index 74965b7..1295081 100644
--- a/crawl-ref/source/art-data.txt
+++ b/crawl-ref/source/art-data.txt
@@ -1179,6 +1179,14 @@ PLUS:    5
 BRAND:   SPWPN_VORPAL
 DEX:     -3
 
+ENUM:    ETHERIC_CAGE
+NAME:    Maxwell's etheric cage
+OBJ:     OBJ_ARMOUR/ARM_HELMET
+COLOUR:  ETC_ELECTRICITY
+PLUS:    +0
+MP:      +4
+BOOL:    mutate, elec
+
 # This entry must always be last.
 ENUM:   DUMMY2
 NAME:   DUMMY UNRANDART 2
diff --git a/crawl-ref/source/art-func.h b/crawl-ref/source/art-func.h
index b5868d8..83d96d8 100644
--- a/crawl-ref/source/art-func.h
+++ b/crawl-ref/source/art-func.h
@@ -1268,3 +1268,33 @@ static void _CAPTAIN_melee_effects(item_def* weapon, actor* attacker,
     }
 
 }
+
+////////////////////////////////////////////////////
+
+static void _ETHERIC_CAGE_equip(item_def *item, bool *show_msgs, bool unmeld)
+{
+    _equip_mpr(show_msgs, "Magical energy is drawn to you!");
+}
+
+static void _ETHERIC_CAGE_world_reacts(item_def *item)
+{
+    int added_contamination = 0;
+
+    if (you.magic_points < you.max_magic_points
+        && one_chance_in(2)
+        && !(you.spirit_shield() && you.species == SP_DEEP_DWARF))
+    {
+        inc_mp(1);
+        // recovering 40 MP will give 600 contam on average
+        if (one_chance_in(20))
+            contaminate_player(200 + random2(200));
+    }
+    /* on avg the player recovers 25 contam per turn, this should keep them in
+       the gray a fair amount of time; be a little nicer if they're already
+       in the yellow */
+    if (one_chance_in(100))
+    {
+        added_contamination = get_contamination_level() > 1 ? 500 : 1000;
+        contaminate_player(added_contamination + random2(added_contamination));
+    }
+}
diff --git a/crawl-ref/source/dat/descript/unrand.txt b/crawl-ref/source/dat/descript/unrand.txt
index efcc3e9..84594de 100644
--- a/crawl-ref/source/dat/descript/unrand.txt
+++ b/crawl-ref/source/dat/descript/unrand.txt
@@ -585,3 +585,8 @@ quick blades "Gyre" and "Gimble"
 Two quick blades joined by a chain. Swinging one compels the wielder to swing
 the other, as if they have minds of their own.
 %%%%
+Maxwell's etheric cage
+
+A spherical cage designed to capture ambient magical energy. Perhaps you could
+wear it on your head?
+%%%%

diff --git a/crawl-ref/source/art-data.txt b/crawl-ref/source/art-data.txt
index 74965b7..1295081 100644
--- a/crawl-ref/source/art-data.txt
+++ b/crawl-ref/source/art-data.txt
@@ -1179,6 +1179,14 @@ PLUS:    5
 BRAND:   SPWPN_VORPAL
 DEX:     -3
 
+ENUM:    ETHERIC_CAGE
+NAME:    Maxwell's etheric cage
+OBJ:     OBJ_ARMOUR/ARM_HELMET
+COLOUR:  ETC_ELECTRICITY
+PLUS:    +0
+MP:      +4
+BOOL:    mutate, elec
+
 # This entry must always be last.
 ENUM:   DUMMY2
 NAME:   DUMMY UNRANDART 2
diff --git a/crawl-ref/source/art-func.h b/crawl-ref/source/art-func.h
index b5868d8..7a5045b 100644
--- a/crawl-ref/source/art-func.h
+++ b/crawl-ref/source/art-func.h
@@ -1268,3 +1268,33 @@ static void _CAPTAIN_melee_effects(item_def* weapon, actor* attacker,
     }
 
 }
+
+////////////////////////////////////////////////////
+
+static void _ETHERIC_CAGE_equip(item_def *item, bool *show_msgs, bool unmeld)
+{
+    _equip_mpr(show_msgs, "Magical energy is drawn to you!");
+}
+
+static void _ETHERIC_CAGE_world_reacts(item_def *item)
+{
+    int added_contamination = 0;
+
+    if (you.magic_points < you.max_magic_points
+        && one_chance_in(2)
+        && !(you.spirit_shield() && you.species == SP_DEEP_DWARF))
+    {
+        inc_mp(1);
+    }
+    /* On average the player recovers 25 contam per turn, this should keep them
+       in the gray a fair amount of time; be nicer if they're already in the
+       yellow.
+       It's more interesting to get a lump of contamination then to just add a
+       small amount every turn, plus there's a small chance of rapid buildup.
+    */
+    if (one_chance_in(100))
+    {
+        added_contamination = get_contamination_level() > 1 ? 300 : 1000;
+        contaminate_player(added_contamination + random2(added_contamination));
+    }
+}
diff --git a/crawl-ref/source/dat/descript/unrand.txt b/crawl-ref/source/dat/descript/unrand.txt
index efcc3e9..166cec8 100644
--- a/crawl-ref/source/dat/descript/unrand.txt
+++ b/crawl-ref/source/dat/descript/unrand.txt
@@ -585,3 +585,9 @@ quick blades "Gyre" and "Gimble"
 Two quick blades joined by a chain. Swinging one compels the wielder to swing
 the other, as if they have minds of their own.
 %%%%
+Maxwell's etheric cage
+
+A spherical cage designed to capture ambient magical energy. Perhaps you could
+wear it on your head? Be warned, experimental notes mention a potential buildup
+of contaminants.
+%%%%