Added a few of the necessary items to start the soul system.

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

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+package WayofTime.bloodmagic.api.iface;
+
+import net.minecraft.item.ItemStack;
+
+public interface ISoul
+{
+    public double getSouls(ItemStack soulStack);
+
+    public void setSouls(ItemStack soulStack, double souls);
+
+    /**
+     * Drains the souls from the soulStack. If all of the souls are drained, the
+     * soulStack will be removed.
+     * 
+     * @param soulStack
+     * @param drainAmount
+     * @return The number of souls drained.
+     */
+    public double drainSouls(ItemStack soulStack, double drainAmount);
+
+    /**
+     * Creates a new ItemStack with the specified number of souls.
+     * Implementation should respect the number requested.
+     * 
+     * @param meta
+     * @param number
+     * @return
+     */
+    public ItemStack createSoul(int meta, double number);
+}

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

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+package WayofTime.bloodmagic.api.iface;
+
+import net.minecraft.item.ItemStack;
+
+public interface ISoulGem
+{
+    /**
+     * 
+     * @param soulGemStack
+     *        - The ItemStack for this soul gem.
+     * @param soulStack
+     *        - The ItemStack for the soul. Item should extend ISoul
+     * @return - The remainder soulStack after the souls have been absorbed into
+     *         the gem. Return null if there are no souls left in the stack.
+     */
+    public ItemStack fillSoulGem(ItemStack soulGemStack, ItemStack soulStack);
+
+    /**
+     * Returns the number of souls that are left in the soul gem. Returns a
+     * double because souls can be fractionally drained.
+     * 
+     * @param soulGemStack
+     * @return
+     */
+    public double getSouls(ItemStack soulGemStack);
+
+    public int getMaxSouls(ItemStack soulGemStack);
+}

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

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+package WayofTime.bloodmagic.api.iface;
+
+import java.util.List;
+
+import net.minecraft.entity.EntityLivingBase;
+import net.minecraft.item.ItemStack;
+
+public interface ISoulWeapon
+{
+    public List<ItemStack> getRandomSoulDrop(EntityLivingBase killedEntity, EntityLivingBase attackingEntity, ItemStack stack, int looting);
+}