Added a spellbook_immune_to damage typ tag

src/main/java/com/minelittlepony/unicopia/UTags.java

@@ -43,6 +43,7 @@ public interface UTags {
     TagKey<StatusEffect> PINEAPPLE_EFFECTS = effect("pineapple_effects");
 
     TagKey<DamageType> BREAKS_SUNGLASSES = damage("breaks_sunglasses");
+    TagKey<DamageType> SPELLBOOK_IMMUNE_TO = damage("spellbook_immune_to");
 
     TagKey<DimensionType> HAS_NO_ATMOSPHERE = dimension("has_no_atmosphere");
 

src/main/java/com/minelittlepony/unicopia/entity/SpellbookEntity.java

@@ -1,6 +1,7 @@
 package com.minelittlepony.unicopia.entity;
 
 import com.minelittlepony.unicopia.EquinePredicates;
+import com.minelittlepony.unicopia.UTags;
 import com.minelittlepony.unicopia.container.SpellbookScreenHandler;
 import com.minelittlepony.unicopia.container.SpellbookState;
 import com.minelittlepony.unicopia.entity.player.MeteorlogicalUtil;
@@ -234,6 +235,16 @@ public class SpellbookEntity extends MobEntity {
         return ActionResult.PASS;
     }
 
+    @Override
+    public boolean isImmuneToExplosion() {
+        return true;
+    }
+
+    @Override
+    public boolean isInvulnerableTo(DamageSource damageSource) {
+        return super.isInvulnerableTo(damageSource) || damageSource.isIn(UTags.SPELLBOOK_IMMUNE_TO);
+    }
+
     @Override
     public void readCustomDataFromNbt(NbtCompound compound) {
         super.readCustomDataFromNbt(compound);

src/main/resources/data/unicopia/tags/damage_type/spellbook_immune_to.json

@@ -0,0 +1,16 @@
+{
+  "replace": false,
+  "values": [
+    "#minecraft:is_fall",
+    "#minecraft:is_freezing",
+    "#minecraft:is_lightning",
+    "#minecraft:is_projectile",
+    "unicopia:zap",
+    "unicopia:love_draining",
+    "unicopia:life_draining",
+    "unicopia:rainboom",
+    "unicopia:sun",
+    "unicopia:sunlight",
+    "unicopia:smash"
+  ]
+}