Implemented most of the framework required for training specific Living Armour Upgrades.

src/main/java/WayofTime/bloodmagic/api/Constants.java

@@ -195,7 +195,8 @@ public class Constants
         SIGIL_WHIRLWIND("ItemSigilWhirlwind"),
         SLATE("ItemSlate"),
         TELEPOSITION_FOCUS("ItemTelepositionFocus"),
-        UPGRADE_TOME("ItemUpgradeTome");
+        UPGRADE_TOME("ItemUpgradeTome"),
+        UPGRADE_TRAINER("ItemUpgradeTrainer");
 
         @Getter
         private final String regName;

src/main/java/WayofTime/bloodmagic/api/iface/IUpgradeTrainer.java

@@ -0,0 +1,16 @@
+package WayofTime.bloodmagic.api.iface;
+
+import java.util.List;
+
+import net.minecraft.item.ItemStack;
+
+/**
+ * This interface is used for items intended to train specific upgrades while
+ * held in the player's inventory.
+ */
+public interface IUpgradeTrainer
+{
+    public List<String> getTrainedUpgrades(ItemStack stack);
+
+    public boolean setTrainedUpgrades(ItemStack stack, List<String> keys);
+}

src/main/java/WayofTime/bloodmagic/api/livingArmour/StatTracker.java

@@ -53,4 +53,6 @@ public abstract class StatTracker
     {
         this.isDirty = false;
     }
+
+    public abstract boolean providesUpgrade(String key);
 }