diff --git a/Common/src/generated/resources/.cache/e5c5eb35b4ba40351ecb7d9f04c3527f2f5779b0 b/Common/src/generated/resources/.cache/e5c5eb35b4ba40351ecb7d9f04c3527f2f5779b0
index 010e48c1..b46c34f8 100644
--- a/Common/src/generated/resources/.cache/e5c5eb35b4ba40351ecb7d9f04c3527f2f5779b0
+++ b/Common/src/generated/resources/.cache/e5c5eb35b4ba40351ecb7d9f04c3527f2f5779b0
@@ -1,7 +1,7 @@
-// 1.19.2	2022-11-09T19:44:43.405259	Advancements
+// 1.19.2	2022-11-29T13:33:14.877218824	Advancements
 b21f0b7f0cda29a7e84693df8139f2fecfeea960 data/hexcasting/advancements/aaa_wasteful_cast.json
 9d8b41dd8ddfccdf2cd19433d8d7d3cf934e64db data/hexcasting/advancements/aab_big_cast.json
-ef61c93d776c6f212820af20909a4c1d92822baf data/hexcasting/advancements/enlightenment.json
+425b42f6da5fd6498053f565dce1f171997dbb8b data/hexcasting/advancements/enlightenment.json
 8f97205fa79270eab688aa3019d6fe7dd8c8b0d3 data/hexcasting/advancements/lore.json
 2f5ad49936d58c7097ac7f8fbbf3f66f9f90fd2c data/hexcasting/advancements/lore/experiment1.json
 9a4eba1c9d7868906e8ea1b4ec287f54a2c379b5 data/hexcasting/advancements/lore/experiment2.json
@@ -11,6 +11,6 @@ ef06ae5bd79e2c52291fbfb3c69bc2f74a604477 data/hexcasting/advancements/lore/terab
 74fbb1ce0e3acf982325b9e9205f774a67956c3c data/hexcasting/advancements/lore/terabithia3.json
 861374b7c144ccdbbd031a3f5042af6718ba42bf data/hexcasting/advancements/lore/terabithia4.json
 e26db8dfa825b7ac572d59a548b610db7c7bf736 data/hexcasting/advancements/lore/terabithia5.json
-2acbfb4efe2a72a1986c8dbe62ad8d93e9613e99 data/hexcasting/advancements/opened_eyes.json
+bf319d71d9e706f9131c9484be1bc83ca2b8b6a3 data/hexcasting/advancements/opened_eyes.json
 d19039a73324eb7532d035d08442f3b68bb13bcb data/hexcasting/advancements/root.json
 b1b82068d65d6872c258d905d4f78499e8227ccf data/hexcasting/advancements/y_u_no_cast_angy.json
diff --git a/Common/src/generated/resources/data/hexcasting/advancements/enlightenment.json b/Common/src/generated/resources/data/hexcasting/advancements/enlightenment.json
index a4c76966..4488f207 100644
--- a/Common/src/generated/resources/data/hexcasting/advancements/enlightenment.json
+++ b/Common/src/generated/resources/data/hexcasting/advancements/enlightenment.json
@@ -7,8 +7,8 @@
           "min": 0.8
         },
         "mojang_i_am_begging_and_crying_please_add_an_entity_health_criterion": {
-          "max": 2.05,
-          "min": 0.1
+          "max": 1.0,
+          "min": 2.2250738585072014E-308
         }
       },
       "trigger": "hexcasting:overcast"
diff --git a/Common/src/generated/resources/data/hexcasting/advancements/opened_eyes.json b/Common/src/generated/resources/data/hexcasting/advancements/opened_eyes.json
index 908477ac..fde10466 100644
--- a/Common/src/generated/resources/data/hexcasting/advancements/opened_eyes.json
+++ b/Common/src/generated/resources/data/hexcasting/advancements/opened_eyes.json
@@ -4,7 +4,7 @@
     "health_used": {
       "conditions": {
         "mojang_i_am_begging_and_crying_please_add_an_entity_health_criterion": {
-          "min": 0.1
+          "min": 0.0
         }
       },
       "trigger": "hexcasting:overcast"
diff --git a/Common/src/main/java/at/petrak/hexcasting/api/advancements/OvercastTrigger.java b/Common/src/main/java/at/petrak/hexcasting/api/advancements/OvercastTrigger.java
index 7b5b8d74..ae972d1c 100644
--- a/Common/src/main/java/at/petrak/hexcasting/api/advancements/OvercastTrigger.java
+++ b/Common/src/main/java/at/petrak/hexcasting/api/advancements/OvercastTrigger.java
@@ -15,7 +15,8 @@ public class OvercastTrigger extends SimpleCriterionTrigger<OvercastTrigger.Inst
     private static final String TAG_MEDIA_GENERATED = "media_generated";
     private static final String TAG_HEALTH_USED = "health_used";
     // HEY KIDS DID YOYU KNOW THERE'S NOT A CRITERIA FOR HOW MUCH ***HEALTH*** AN ENTITY HAS
-    private static final String TAG_HEALTH_LEFT = "mojang_i_am_begging_and_crying_please_add_an_entity_health_criterion";
+    private static final String TAG_HEALTH_LEFT =
+        "mojang_i_am_begging_and_crying_please_add_an_entity_health_criterion";
 
     @Override
     public ResourceLocation getId() {
@@ -41,6 +42,7 @@ public class OvercastTrigger extends SimpleCriterionTrigger<OvercastTrigger.Inst
 
     public static class Instance extends AbstractCriterionTriggerInstance {
         protected final MinMaxBounds.Ints mediaGenerated;
+        // This is the *proporttion* of the health bar.
         protected final MinMaxBounds.Doubles healthUsed;
         // DID YOU KNOW THERES ONE TO CHECK THE WORLD TIME, BUT NOT THE HEALTH!?
         protected final MinMaxBounds.Doubles healthLeft;
diff --git a/Common/src/main/java/at/petrak/hexcasting/api/spell/casting/CastingHarness.kt b/Common/src/main/java/at/petrak/hexcasting/api/spell/casting/CastingHarness.kt
index cf799b84..b702d116 100644
--- a/Common/src/main/java/at/petrak/hexcasting/api/spell/casting/CastingHarness.kt
+++ b/Common/src/main/java/at/petrak/hexcasting/api/spell/casting/CastingHarness.kt
@@ -38,6 +38,7 @@ import net.minecraft.sounds.SoundSource
 import net.minecraft.util.Mth
 import net.minecraft.world.level.gameevent.GameEvent
 import net.minecraft.world.phys.Vec3
+import kotlin.math.max
 import kotlin.math.min
 
 /**
@@ -542,7 +543,7 @@ class CastingHarness private constructor(
                 if (allowOvercast && costLeft > 0) {
                     // Cast from HP!
                     val mediaToHealth = HexConfig.common().mediaToHealthRate()
-                    val healthToRemove = costLeft.toDouble() / mediaToHealth
+                    val healthToRemove = max(costLeft.toDouble() / mediaToHealth, 0.5)
                     val mediaAbleToCastFromHP = this.ctx.caster.health * mediaToHealth
 
                     val mediaToActuallyPayFor = min(mediaAbleToCastFromHP.toInt(), costLeft)
diff --git a/Common/src/main/java/at/petrak/hexcasting/datagen/HexAdvancements.java b/Common/src/main/java/at/petrak/hexcasting/datagen/HexAdvancements.java
index 2b1651d3..9f220aa5 100644
--- a/Common/src/main/java/at/petrak/hexcasting/datagen/HexAdvancements.java
+++ b/Common/src/main/java/at/petrak/hexcasting/datagen/HexAdvancements.java
@@ -5,19 +5,15 @@ import at.petrak.hexcasting.api.advancements.FailToCastGreatSpellTrigger;
 import at.petrak.hexcasting.api.advancements.OvercastTrigger;
 import at.petrak.hexcasting.api.advancements.SpendMediaTrigger;
 import at.petrak.hexcasting.api.misc.MediaConstants;
+import at.petrak.hexcasting.api.mod.HexItemTags;
 import at.petrak.hexcasting.common.items.ItemLoreFragment;
 import at.petrak.hexcasting.common.lib.HexBlocks;
-import at.petrak.hexcasting.api.mod.HexItemTags;
 import at.petrak.hexcasting.common.lib.HexItems;
 import at.petrak.paucal.api.datagen.PaucalAdvancementProvider;
 import net.minecraft.advancements.Advancement;
 import net.minecraft.advancements.DisplayInfo;
 import net.minecraft.advancements.FrameType;
 import net.minecraft.advancements.critereon.*;
-import net.minecraft.advancements.critereon.EntityPredicate;
-import net.minecraft.advancements.critereon.InventoryChangeTrigger;
-import net.minecraft.advancements.critereon.ItemPredicate;
-import net.minecraft.advancements.critereon.MinMaxBounds;
 import net.minecraft.data.DataGenerator;
 import net.minecraft.network.chat.Component;
 import net.minecraft.resources.ResourceLocation;
@@ -77,7 +73,7 @@ public class HexAdvancements extends PaucalAdvancementProvider {
                     MinMaxBounds.Ints.ANY,
                     MinMaxBounds.Doubles.ANY,
                     // you can't just kill yourself
-                    MinMaxBounds.Doubles.atLeast(0.1)))
+                    MinMaxBounds.Doubles.atLeast(0.0)))
             .save(consumer, prefix("opened_eyes"));
 
         Advancement.Builder.advancement()
@@ -90,9 +86,12 @@ public class HexAdvancements extends PaucalAdvancementProvider {
             .addCriterion("health_used",
                 new OvercastTrigger.Instance(EntityPredicate.Composite.ANY,
                     MinMaxBounds.Ints.ANY,
-                    // add a little bit of slop here
+                    // add a little bit of slop here. use 80% or more health ...
                     MinMaxBounds.Doubles.atLeast(0.8),
-                    MinMaxBounds.Doubles.between(0.1, 2.05)))
+                    // and be left with under 1 healthpoint (half a heart)
+                    // TODO this means if 80% of your health is less than half a heart, so if you have 2.5 hearts or
+                    //  less, you can't become enlightened.
+                    MinMaxBounds.Doubles.between(Double.MIN_NORMAL, 1.0)))
             .save(consumer, prefix("enlightenment"));
 
         var loreRoot = Advancement.Builder.advancement()