diff --git a/index.html b/index.html
index 63a9783..1784764 100644
--- a/index.html
+++ b/index.html
@@ -86,7 +86,6 @@
 		<div id="pause-grid-right" class="pause-grid"></div>
 	</div>
 	<svg class="SVG-button" id="build-button" width="110" height="40">
-		<title>Select 5 power ups and see how far you can progress.</title>
 		<g stroke='none' fill='#333' stroke-width="2" font-size="28px" font-family="Arial, sans-serif">
 			<text x="10" y="30">custom</text>
 		</g>
diff --git a/js/bullets.js b/js/bullets.js
index b657e88..56b88bf 100644
--- a/js/bullets.js
+++ b/js/bullets.js
@@ -13,7 +13,7 @@ const b = {
   modNoAmmo: null,
   isModBulletsLastLonger: null,
   isModImmortal: null,
-  modSpores: null,
+  modSporesOnDeath: null,
   isModImmuneExplosion: null,
   isModExplodeMob: null,
   isModDroneOnDamage: null,
@@ -52,6 +52,8 @@ const b = {
   isModDeathAvoidOnCD: null,
   modWaveSpeedMap: null,
   modWaveSpeedBody: null,
+  modFieldEfficiency: null,
+  isModSporeField: null,
   modOnHealthChange() { //used with acid mod
     if (b.isModAcidDmg && mech.health > 0.8) {
       game.playerDmgColor = "rgba(0,80,80,0.9)"
@@ -268,13 +270,13 @@ const b = {
       },
       requires: "",
       effect() {
-        b.modSpores += 0.11;
+        b.modSporesOnDeath += 0.11;
         for (let i = 0; i < 10; i++) {
           b.spore(player)
         }
       },
       remove() {
-        b.modSpores = 0;
+        b.modSporesOnDeath = 0;
       }
     },
     {
@@ -513,7 +515,7 @@ const b = {
     },
     {
       name: "weak anthropic principle",
-      description: "<strong>avoid harm</strong> that should be <strong>fatal</strong><br>can occur once every <strong>3</strong> seconds",
+      description: "<strong>fatal harm</strong> can't happen<br>saves you up to once every <strong>3</strong> seconds",
       maxCount: 1,
       count: 0,
       allowed() {
@@ -746,7 +748,7 @@ const b = {
       maxCount: 1,
       count: 0,
       allowed() {
-        return b.haveGunCheck("drones") || mech.fieldUpgrades[mech.fieldMode].name === "nano-scale manufacturing"
+        return b.haveGunCheck("drones") || (mech.fieldUpgrades[mech.fieldMode].name === "nano-scale manufacturing" && !b.isModSporeField)
       },
       requires: "drones",
       effect() {
@@ -762,7 +764,7 @@ const b = {
       maxCount: 1,
       count: 0,
       allowed() {
-        return b.haveGunCheck("spores") || b.modSpores > 0 || b.isModStomp
+        return b.haveGunCheck("spores") || b.modSporesOnDeath > 0 || b.isModStomp || b.isModSporeField
       },
       requires: "spores",
       effect() {
@@ -773,8 +775,8 @@ const b = {
       }
     },
     {
-      name: "ice crystal nucleation",
-      description: "fire <strong>ice crystals</strong> formed from water vapour<br>your <strong>minigun</strong> no longer requires <strong>ammo<strong>",
+      name: "crystal nucleation",
+      description: "fire <strong>crystals</strong> formed from the air<br>your <strong>minigun</strong> no longer requires <strong>ammo<strong>",
       maxCount: 1,
       count: 0,
       allowed() {
@@ -894,6 +896,40 @@ const b = {
         b.modWaveSpeedBody = 0.25
       }
     },
+    {
+      name: "perfect diamagnetism",
+      description: "when <strong>blocking</strong> with the basic <strong>field emitter</strong><br>gain <strong class='color-f'>energy</strong> instead losing it",
+      maxCount: 1,
+      count: 0,
+      allowed() {
+        return mech.fieldUpgrades[mech.fieldMode].name === "field emitter"
+      },
+      requires: "basic field emitter",
+      effect() {
+        b.modFieldEfficiency = -1
+        mech.fieldShieldingScale = b.modFieldEfficiency;
+      },
+      remove() {
+        b.modFieldEfficiency = 1;
+        if (mech.fieldUpgrades[mech.fieldMode].name === "field emitter") mech.fieldShieldingScale = b.modFieldEfficiency;
+      }
+    },
+    {
+      name: "mycelium manufacturing",
+      description: "<strong>nano-scale manufacturing</strong> is modified to<br>grow <strong style='letter-spacing: 2px;'>spores</strong> instead of drones",
+      maxCount: 1,
+      count: 0,
+      allowed() {
+        return mech.fieldUpgrades[mech.fieldMode].name === "nano-scale manufacturing"
+      },
+      requires: "nano-scale manufacturing",
+      effect() {
+        b.isModSporeField = true;
+      },
+      remove() {
+        b.isModSporeField = false;
+      }
+    },
 
     // {
     //   name: "super mines",
diff --git a/js/level.js b/js/level.js
index 853913d..300f408 100644
--- a/js/level.js
+++ b/js/level.js
@@ -13,21 +13,21 @@ const level = {
   levelsCleared: 0,
   start() {
     if (level.levelsCleared === 0) {
-      level.difficultyIncrease(5)
+      // level.difficultyIncrease(9)
       // b.giveGuns("wave beam")
-      // mech.setField("negative mass field")
+      // mech.setField("nano-scale manufacturing")
       // for (let i = 0; i < 9; i++) {
-      // b.giveMod("wave phase velocity");
+      // b.giveMod("mycelium manufacturing");
       // b.giveMod("anthropic principle");
       // b.giveMod("acute stress response");
       // }
 
-      // level.intro(); //starting level
+      level.intro(); //starting level
       // level.testingMap();
       // level.bosses();
       // level.satellite();
       // level.skyscrapers();
-      level.aerie();
+      // level.aerie();
       // level.rooftops();
       // level.warehouse();
       // level.highrise();
@@ -144,7 +144,7 @@ const level = {
     // powerUps.spawn(450, -400, "mod", false);
     // spawn.bodyRect(-45, -100, 40, 50);
     spawn.springer(800, -450);
-    // spawn.cellBoss(400, -750);
+    spawn.cellBoss(400, -750);
 
     // spawn.randomLevelBoss(400, -750)
 
diff --git a/js/mobs.js b/js/mobs.js
index 236a7e7..566b3df 100644
--- a/js/mobs.js
+++ b/js/mobs.js
@@ -967,7 +967,7 @@ const mobs = {
         if (this.dropPowerUp) {
           powerUps.spawnRandomPowerUp(this.position.x, this.position.y, this.mass, radius);
           mech.lastKillCycle = mech.cycle; //tracks the last time a kill was made, mostly used in game.checks()
-          if (Math.random() < b.modSpores) {
+          if (Math.random() < b.modSporesOnDeath) {
             const len = Math.min(30, Math.floor(4 + this.mass * Math.random()))
             for (let i = 0; i < len; i++) {
               b.spore(this) //spawn drone
diff --git a/js/player.js b/js/player.js
index e3cf049..e9c7ccd 100644
--- a/js/player.js
+++ b/js/player.js
@@ -663,6 +663,7 @@ const mech = {
   fieldMode: 0, //basic field mode before upgrades
   fieldEnergyMax: 1, //can be increased by a mod
   holdingTarget: null,
+  fieldShieldingScale: 1,
   // these values are set on reset by setHoldDefaults()
   fieldMeter: 0,
   fieldRegen: 0,
@@ -671,7 +672,6 @@ const mech = {
   holdingMassScale: 0,
   throwChargeRate: 0,
   throwChargeMax: 0,
-  fieldShieldingScale: 0,
   fieldRange: 175,
   fieldArc: 0,
   fieldThreshold: 0,
@@ -685,7 +685,7 @@ const mech = {
     mech.fieldCDcycle = 0;
     mech.isStealth = false;
     player.collisionFilter.mask = cat.body | cat.map | cat.mob | cat.mobBullet | cat.mobShield
-    mech.fieldShieldingScale = 1; //scale energy loss after collision with mob
+    // mech.fieldShieldingScale = 1; //scale energy loss after collision with mob
     mech.holdingMassScale = 0.5;
     mech.throwChargeRate = 2;
     mech.throwChargeMax = 50;
@@ -932,6 +932,7 @@ const mech = {
     if (mech.fieldMeter > fieldBlockCost * 0.2) { //shield needs at least some of the cost to block
       mech.fieldMeter -= fieldBlockCost * mech.fieldShieldingScale;
       if (mech.fieldMeter < 0) mech.fieldMeter = 0;
+      if (mech.fieldMeter > mech.fieldEnergyMax) mech.fieldMeter = mech.fieldEnergyMax;
       mech.drawHold(who);
       mech.fieldCDcycle = mech.cycle + 10;
       mech.holdingTarget = null
@@ -1120,6 +1121,7 @@ const mech = {
       name: "field emitter",
       description: "use <strong class='color-f'>energy</strong> to <strong>shield</strong> yourself from <strong class='color-d'>damage</strong><br>lets you <strong>pick up</strong> and <strong>throw</strong> objects",
       effect: () => {
+        mech.fieldShieldingScale = Number(b.modFieldEfficiency);
         game.replaceTextLog = true; //allow text over write
         mech.hold = function () {
           if (mech.isHolding) {
@@ -1510,8 +1512,17 @@ const mech = {
         mech.hold = function () {
           if (mech.fieldMeter > mech.fieldEnergyMax - 0.02 && mech.fieldCDcycle < mech.cycle) {
             mech.fieldCDcycle = mech.cycle + 17; // set cool down to prevent +energy from making huge numbers of drones
-            mech.fieldMeter -= 0.35;
-            b.drone(1)
+            if (b.isModSporeField) {
+              const len = Math.floor(6 + 3 * Math.random())
+              mech.fieldMeter -= len * 0.12;
+              for (let i = 0; i < len; i++) {
+                b.spore(player)
+              }
+            } else {
+              mech.fieldMeter -= 0.33;
+              b.drone(1)
+            }
+
           }
           if (mech.isHolding) {
             mech.drawHold(mech.holdingTarget);
diff --git a/js/powerups.js b/js/powerups.js
index 84e0177..80779af 100644
--- a/js/powerups.js
+++ b/js/powerups.js
@@ -25,12 +25,14 @@ const powerUps = {
     game.isChoosing = false; //stops p from un pausing on key down
     requestAnimationFrame(cycle);
   },
-  cancel() {
+  isCanceledField: false,
+  cancel(what) {
     document.body.style.cursor = "none";
     document.getElementById("choose-grid").style.display = "none"
     document.getElementById("choose-background").style.display = "none"
     game.paused = false;
     game.isChoosing = false; //stops p from un pausing on key down
+    if (what === "field") powerUps.isCanceledField = true;
     requestAnimationFrame(cycle);
   },
   showDraft() {
@@ -109,7 +111,7 @@ const powerUps = {
       let choice2 = pick(mech.fieldUpgrades, choice1)
       let choice3 = -1
       if (choice1 > -1) {
-        let text = `<div class='cancel' onclick='powerUps.cancel()'>✕</div><h3 style = 'color:#fff; text-align:left; margin: 0px;'>choose a field</h3>`
+        let text = `<div class='cancel' onclick='powerUps.cancel("field")'>✕</div><h3 style = 'color:#fff; text-align:left; margin: 0px;'>choose a field</h3>`
         text += `<div class="choose-grid-module" onclick="powerUps.choose('field',${choice1})"><div class="grid-title"><div class="circle-grid field"></div> &nbsp; ${mech.fieldUpgrades[choice1].name}</div> ${mech.fieldUpgrades[choice1].description}</div>`
         if (choice2 > -1) text += `<div class="choose-grid-module" onclick="powerUps.choose('field',${choice2})"><div class="grid-title"><div class="circle-grid field"></div> &nbsp; ${mech.fieldUpgrades[choice2].name}</div> ${mech.fieldUpgrades[choice2].description}</div>`
         if (!b.isModBayesian) {
@@ -153,7 +155,7 @@ const powerUps = {
       let choice2 = pick(choice1)
       let choice3 = -1
       if (choice1 > -1) {
-        let text = "<div class='cancel' onclick='powerUps.cancel()'>✕</div><h3 style = 'color:#fff; text-align:left; margin: 0px;'>choose a mod</h3>"
+        let text = `<div class='cancel' onclick='powerUps.cancel("mod")'>✕</div><h3 style = 'color:#fff; text-align:left; margin: 0px;'>choose a mod</h3>`
         text += `<div class="choose-grid-module" onclick="powerUps.choose('mod',${choice1})"><div class="grid-title"><div class="circle-grid mod"></div> &nbsp; ${b.mods[choice1].name}</div> ${b.mods[choice1].description}</div>`
         if (choice2 > -1) text += `<div class="choose-grid-module" onclick="powerUps.choose('mod',${choice2})"><div class="grid-title"><div class="circle-grid mod"></div> &nbsp; ${b.mods[choice2].name}</div> ${b.mods[choice2].description}</div>`
         if (!b.isModBayesian) {
@@ -190,7 +192,7 @@ const powerUps = {
       let choice2 = pick(b.guns, choice1)
       let choice3 = -1
       if (choice1 > -1) {
-        let text = "<div class='cancel' onclick='powerUps.cancel()'>✕</div><h3 style = 'color:#fff; text-align:left; margin: 0px;'>choose a gun</h3>"
+        let text = `<div class='cancel' onclick='powerUps.cancel("gun")'>✕</div><h3 style = 'color:#fff; text-align:left; margin: 0px;'>choose a gun</h3>`
         text += `<div class="choose-grid-module" onclick="powerUps.choose('gun',${choice1})"><div class="grid-title"><div class="circle-grid gun"></div> &nbsp; ${b.guns[choice1].name}</div> ${b.guns[choice1].description}</div>`
         if (choice2 > -1) text += `<div class="choose-grid-module" onclick="powerUps.choose('gun',${choice2})"><div class="grid-title"><div class="circle-grid gun"></div> &nbsp; ${b.guns[choice2].name}</div> ${b.guns[choice2].description}</div>`
         if (!b.isModBayesian) {
@@ -248,7 +250,7 @@ const powerUps = {
     }
   },
   spawnBossPowerUp(x, y) { //boss spawns field and gun mod upgrades
-    if (mech.fieldMode === 0) {
+    if (mech.fieldMode === 0 && !powerUps.isCanceledField) {
       powerUps.spawn(x, y, "field")
       if (Math.random() < b.isModBayesian) powerUps.spawn(x, y, "field")
     } else if (Math.random() < 0.80) {
diff --git a/todo.txt b/todo.txt
index e694c58..0433ea2 100644
--- a/todo.txt
+++ b/todo.txt
@@ -1,7 +1,11 @@
 ************** TODO - n-gon **************
 
-level - add wrecking ball boss to other levels
-  it could work on rooftops and satellite
+mod - ice crystal nucleaution should slow down mobs
+  add an on hit effect to *1.1 air friction?
+
+mod - starter field can block attacks with out draining energy
+
+mod - rail gun burst on impact into nails
 
 mod - make bodies destroyable
   they drop ammo and heals