That's one heck of a commit you've got there...

I may have got a bit behind with version control. A lot behind, in fact. Maybe I'll go back and split this sometime - then again, I probably won't. But hey, at least it's here!

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

@@ -0,0 +1,46 @@
+package electroblob.wizardry.spell;
+
+import electroblob.wizardry.Wizardry;
+import electroblob.wizardry.registry.WizardryPotions;
+import electroblob.wizardry.util.SpellModifiers;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.util.EnumHand;
+import net.minecraft.util.ResourceLocation;
+import net.minecraft.world.World;
+
+public class SlowTime extends SpellBuff {
+
+	/** A {@code ResourceLocation} representing the shader file used when possessing an entity. */
+	public static final ResourceLocation SHADER = new ResourceLocation(Wizardry.MODID, "shaders/post/slow_time.json");
+
+	public SlowTime(){
+		super("slow_time", 0.2f, 0.8f, 0.8f, () -> WizardryPotions.slow_time);
+		addProperties(EFFECT_RADIUS);
+		soundValues(0.6f, 1.5f, 0);
+	}
+
+	@Override
+	public boolean cast(World world, EntityPlayer caster, EnumHand hand, int ticksInUse, SpellModifiers modifiers){
+
+		if(caster.world.isRemote && caster == net.minecraft.client.Minecraft.getMinecraft().player){
+			if(Wizardry.settings.useShaders) net.minecraft.client.Minecraft.getMinecraft().entityRenderer.loadShader(SHADER);
+		}
+
+		return super.cast(world, caster, hand, ticksInUse, modifiers);
+	}
+
+	@Override
+	public boolean requiresPacket(){
+		return false;
+	}
+
+	@Override
+	public boolean canBeCastByDispensers(){
+		return false;
+	}
+
+	@Override
+	public boolean canBeCastByNPCs(){
+		return false;
+	}
+}