Add archivist's eyeglass and spectral tether, plus some improvements to teleportation

src/main/java/electroblob/wizardry/loot/RandomSpell.java

@@ -5,9 +5,11 @@ import electroblob.wizardry.Wizardry;
 import electroblob.wizardry.constants.Element;
 import electroblob.wizardry.constants.Tier;
 import electroblob.wizardry.data.WizardData;
+import electroblob.wizardry.item.ItemArtefact;
 import electroblob.wizardry.item.ItemScroll;
 import electroblob.wizardry.item.ItemSpellBook;
 import electroblob.wizardry.registry.Spells;
+import electroblob.wizardry.registry.WizardryItems;
 import electroblob.wizardry.spell.Spell;
 import electroblob.wizardry.util.SpellProperties;
 import net.minecraft.entity.player.EntityPlayer;
@@ -150,8 +152,12 @@ public class RandomSpell extends LootFunction {
 		possibleSpells.removeIf(s -> s.getElement() != element);
 		if(possibleSpells.isEmpty()) return Spells.none; // If it fails anywhere, it'll most likely be here
 
+		float bias = undiscoveredBias;
+		// Archivist's eyeglass increases undiscovered bias by 0.4 up to a maximum of 0.9
+		if(ItemArtefact.isArtefactActive(player, WizardryItems.charm_spell_discovery)) bias = Math.min(bias + 0.4f, 0.9f);
+
 		// Remove either the undiscovered spells or the discovered ones, depending on the bias
-		if(undiscoveredBias > 0 && player != null){
+		if(bias > 0 && player != null){
 
 			WizardData data = WizardData.get(player);
 
@@ -159,7 +165,7 @@ public class RandomSpell extends LootFunction {
 			// If none have been discovered or they've all been discovered, don't bother!
 			if(discoveredCount > 0 && discoveredCount < possibleSpells.size()){
 				// Kinda unintuitive but it's very neat!
-				boolean keepDiscovered = random.nextFloat() < 0.5f + 0.5f * undiscoveredBias;
+				boolean keepDiscovered = random.nextFloat() < 0.5f + 0.5f * bias;
 				possibleSpells.removeIf(s -> keepDiscovered != data.hasSpellBeenDiscovered(s));
 			}
 		}