'Tis the season!

- Decked the halls
- Jingled the bells
- Wrapped the presents
- Loaded up the sleigh

src/main/java/electroblob/wizardry/spell/EmpoweringPresence.java

@@ -1,5 +1,6 @@
 package electroblob.wizardry.spell;
 
+import electroblob.wizardry.Wizardry;
 import electroblob.wizardry.constants.Constants;
 import electroblob.wizardry.event.SpellCastEvent;
 import electroblob.wizardry.registry.WizardryItems;
@@ -66,6 +67,11 @@ public class EmpoweringPresence extends Spell {
 		return true;
 	}
 
+	@Override
+	protected String getTranslationKey(){
+		return Wizardry.tisTheSeason ? super.getTranslationKey() + "_festive" : super.getTranslationKey();
+	}
+
 	@SubscribeEvent(priority = EventPriority.LOW) // Doesn't really matter but there's no point processing it if casting is blocked
 	public static void onSpellCastPreEvent(SpellCastEvent.Pre event){
 		// Empowerment stacks extra potency on top of the existing potency.
@@ -78,4 +84,5 @@ public class EmpoweringPresence extends Spell {
 					event.getModifiers().get(SpellModifiers.POTENCY) * potency, true);
 		}
 	}
+
 }

src/main/java/electroblob/wizardry/spell/InvigoratingPresence.java

@@ -1,5 +1,6 @@
 package electroblob.wizardry.spell;
 
+import electroblob.wizardry.Wizardry;
 import electroblob.wizardry.registry.WizardryItems;
 import electroblob.wizardry.util.AllyDesignationSystem;
 import electroblob.wizardry.util.ParticleBuilder;
@@ -62,4 +63,9 @@ public class InvigoratingPresence extends Spell {
 		return true;
 	}
 
+	@Override
+	protected String getTranslationKey(){
+		return Wizardry.tisTheSeason ? super.getTranslationKey() + "_festive" : super.getTranslationKey();
+	}
+
 }

src/main/java/electroblob/wizardry/spell/Spell.java

@@ -597,13 +597,23 @@ public abstract class Spell extends IForgeRegistryEntry.Impl<Spell> implements C
 	 * translating it. If, for whatever reason, you need to supply an ITextComponent but don't want it translated
 	 * (perhaps a name?), you can use TextComponentString, which will simply keep the raw string it is given. */
 
+	/** Returns the translation key for this spell. */
+	protected String getTranslationKey(){
+		return "spell." + unlocalisedName;
+	}
+
+	/** Returns the translation key for this spell's description. */
+	protected String getDescriptionTranslationKey(){
+		return "spell." + unlocalisedName + ".desc";
+	}
+
 	/**
 	 * Returns the translated display name of the spell, without formatting (i.e. not coloured). <b>Client-side
 	 * only!</b> On the server side, use {@link TextComponentTranslation} (see {@link Spell#getNameForTranslation()}).
 	 */
 	@SideOnly(Side.CLIENT)
 	public String getDisplayName(){
-		return net.minecraft.client.resources.I18n.format("spell." + unlocalisedName);
+		return net.minecraft.client.resources.I18n.format(getTranslationKey());
 	}
 
 	/**
@@ -611,7 +621,7 @@ public abstract class Spell extends IForgeRegistryEntry.Impl<Spell> implements C
 	 * formatting (i.e. not coloured).
 	 */
 	public ITextComponent getNameForTranslation(){
-		return new TextComponentTranslation("spell." + unlocalisedName);
+		return new TextComponentTranslation(getTranslationKey());
 	}
 
 	/**
@@ -620,7 +630,7 @@ public abstract class Spell extends IForgeRegistryEntry.Impl<Spell> implements C
 	 */
 	@SideOnly(Side.CLIENT)
 	public String getDisplayNameWithFormatting(){
-		return this.getElement().getFormattingCode() + net.minecraft.client.resources.I18n.format("spell." + unlocalisedName);
+		return this.getElement().getFormattingCode() + net.minecraft.client.resources.I18n.format(getTranslationKey());
 	}
 
 	/**
@@ -628,7 +638,7 @@ public abstract class Spell extends IForgeRegistryEntry.Impl<Spell> implements C
 	 * formatting (i.e. coloured).
 	 */
 	public ITextComponent getNameForTranslationFormatted(){
-		return new TextComponentTranslation("spell." + unlocalisedName).setStyle(this.getElement().getColour());
+		return new TextComponentTranslation(getTranslationKey()).setStyle(this.getElement().getColour());
 	}
 
 	/**
@@ -637,7 +647,7 @@ public abstract class Spell extends IForgeRegistryEntry.Impl<Spell> implements C
 	 */
 	@SideOnly(Side.CLIENT)
 	public String getDescription(){
-		return net.minecraft.client.resources.I18n.format("spell." + unlocalisedName + ".desc");
+		return net.minecraft.client.resources.I18n.format(getDescriptionTranslationKey());
 	}
 
 	// ============================================ Sound methods ==============================================

src/main/java/electroblob/wizardry/spell/SummonSnowGolem.java

@@ -1,5 +1,6 @@
 package electroblob.wizardry.spell;
 
+import electroblob.wizardry.Wizardry;
 import electroblob.wizardry.util.ParticleBuilder;
 import electroblob.wizardry.util.ParticleBuilder.Type;
 import electroblob.wizardry.util.SpellModifiers;
@@ -9,7 +10,11 @@ import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.item.EnumAction;
 import net.minecraft.util.EnumHand;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.text.ITextComponent;
+import net.minecraft.util.text.TextComponentTranslation;
 import net.minecraft.world.World;
+import net.minecraftforge.fml.relauncher.Side;
+import net.minecraftforge.fml.relauncher.SideOnly;
 
 public class SummonSnowGolem extends Spell {
 
@@ -45,4 +50,8 @@ public class SummonSnowGolem extends Spell {
 		return true;
 	}
 
+	@Override
+	protected String getTranslationKey(){
+		return Wizardry.tisTheSeason ? super.getTranslationKey() + "_festive" : super.getTranslationKey();
+	}
 }