diff --git a/pom.xml b/pom.xml
index 77a5697..1c69573 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>net.knarcraft</groupId>
     <artifactId>MiniGames</artifactId>
-    <version>1.2</version>
+    <version>1.3-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>MiniGames</name>
@@ -114,7 +114,7 @@
         <dependency>
             <groupId>org.spigotmc</groupId>
             <artifactId>spigot-api</artifactId>
-            <version>1.20.6-R0.1-SNAPSHOT</version>
+            <version>1.21.4-R0.1-SNAPSHOT</version>
             <scope>provided</scope>
         </dependency>
         <dependency>
diff --git a/src/main/java/net/knarcraft/minigames/arena/ArenaGameMode.java b/src/main/java/net/knarcraft/minigames/arena/ArenaGameMode.java
index e90249b..ca125ae 100644
--- a/src/main/java/net/knarcraft/minigames/arena/ArenaGameMode.java
+++ b/src/main/java/net/knarcraft/minigames/arena/ArenaGameMode.java
@@ -12,13 +12,15 @@ public interface ArenaGameMode {
      *
      * @return <p>The name of this game-mode</p>
      */
-    @NotNull String name();
+    @NotNull
+    String name();
 
     /**
      * Gets a set of all available arena game-modes in the type definition of this game-mode
      *
      * @return <p>All game-modes in this game-mode's class</p>
      */
-    @NotNull ArenaGameMode[] getValues();
+    @NotNull
+    ArenaGameMode[] getValues();
 
 }
diff --git a/src/main/java/net/knarcraft/minigames/arena/ArenaSession.java b/src/main/java/net/knarcraft/minigames/arena/ArenaSession.java
index eb1564e..4b52118 100644
--- a/src/main/java/net/knarcraft/minigames/arena/ArenaSession.java
+++ b/src/main/java/net/knarcraft/minigames/arena/ArenaSession.java
@@ -13,7 +13,8 @@ public interface ArenaSession {
      *
      * @return <p>The player's entry state</p>
      */
-    @NotNull PlayerEntryState getEntryState();
+    @NotNull
+    PlayerEntryState getEntryState();
 
     /**
      * Triggers a win for the player playing in this session
@@ -38,14 +39,16 @@ public interface ArenaSession {
      *
      * @return <p>The session's arena</p>
      */
-    @NotNull Arena getArena();
+    @NotNull
+    Arena getArena();
 
     /**
      * Gets the GUI with this arena's options
      *
      * @return <p>This arena's GUI</p>
      */
-    @NotNull ArenaGUI getGUI();
+    @NotNull
+    ArenaGUI getGUI();
 
     /**
      * Resets the session to allow a player to try again
@@ -57,6 +60,7 @@ public interface ArenaSession {
      *
      * @return <p>The game-mode the player is playing</p>
      */
-    @NotNull ArenaGameMode getGameMode();
+    @NotNull
+    ArenaGameMode getGameMode();
 
 }
diff --git a/src/main/java/net/knarcraft/minigames/arena/StorageKey.java b/src/main/java/net/knarcraft/minigames/arena/StorageKey.java
index 2bbae2c..d48d0e2 100644
--- a/src/main/java/net/knarcraft/minigames/arena/StorageKey.java
+++ b/src/main/java/net/knarcraft/minigames/arena/StorageKey.java
@@ -12,6 +12,7 @@ public interface StorageKey {
      *
      * @return <p>The string key representation.</p>
      */
-    @NotNull String getKey();
+    @NotNull
+    String getKey();
 
 }
diff --git a/src/main/java/net/knarcraft/minigames/arena/reward/ItemReward.java b/src/main/java/net/knarcraft/minigames/arena/reward/ItemReward.java
index fde135b..6694d47 100644
--- a/src/main/java/net/knarcraft/minigames/arena/reward/ItemReward.java
+++ b/src/main/java/net/knarcraft/minigames/arena/reward/ItemReward.java
@@ -2,6 +2,7 @@ package net.knarcraft.minigames.arena.reward;
 
 import net.knarcraft.minigames.MiniGames;
 import net.knarcraft.minigames.config.MiniGameMessage;
+import org.bukkit.NamespacedKey;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.Inventory;
 import org.bukkit.inventory.ItemStack;
@@ -43,9 +44,10 @@ public class ItemReward implements Reward {
 
     @Override
     public @NotNull String getGrantMessage() {
+        NamespacedKey key = item.getType().getKeyOrNull();
+        String name = key == null ? "Unnamed item" : key.getKey().replace("_", " ");
         return MiniGames.getInstance().getStringFormatter().replacePlaceholders(MiniGameMessage.SUCCESS_ITEM_REWARDED,
-                new String[]{"{amount}", "{item}"}, new String[]{String.valueOf(item.getAmount()),
-                        item.getType().getKey().getKey().replace("_", " ")});
+                new String[]{"{amount}", "{item}"}, new String[]{String.valueOf(item.getAmount()), name});
     }
 
     @NotNull
diff --git a/src/main/java/net/knarcraft/minigames/arena/reward/Reward.java b/src/main/java/net/knarcraft/minigames/arena/reward/Reward.java
index 2c09234..66d25b4 100644
--- a/src/main/java/net/knarcraft/minigames/arena/reward/Reward.java
+++ b/src/main/java/net/knarcraft/minigames/arena/reward/Reward.java
@@ -22,6 +22,7 @@ public interface Reward extends ConfigurationSerializable {
      *
      * @return <p>The message to display when this reward is granted</p>
      */
-    @NotNull String getGrantMessage();
+    @NotNull
+    String getGrantMessage();
 
 }
diff --git a/src/main/java/net/knarcraft/minigames/listener/DamageListener.java b/src/main/java/net/knarcraft/minigames/listener/DamageListener.java
index d41da09..2f147a1 100644
--- a/src/main/java/net/knarcraft/minigames/listener/DamageListener.java
+++ b/src/main/java/net/knarcraft/minigames/listener/DamageListener.java
@@ -62,10 +62,13 @@ public class DamageListener implements Listener {
      * @param arenaSession <p>The arena session to trigger a loss for, if the player reaches 0 damage</p>
      */
     private void applyFakeDamage(@NotNull Player player, double damage, @NotNull ArenaSession arenaSession) {
+        if (player.getNoDamageTicks() > 0) {
+            return;
+        }
         double newHealth = player.getHealth() - damage;
         player.sendHurtAnimation(180);
         if (newHealth <= 0) {
-            AttributeInstance health = player.getAttribute(Attribute.GENERIC_MAX_HEALTH);
+            AttributeInstance health = player.getAttribute(Attribute.MAX_HEALTH);
             if (health != null) {
                 player.setHealth(health.getValue());
             }
diff --git a/src/main/java/net/knarcraft/minigames/util/TabCompleteHelper.java b/src/main/java/net/knarcraft/minigames/util/TabCompleteHelper.java
index e2f3690..4c53872 100644
--- a/src/main/java/net/knarcraft/minigames/util/TabCompleteHelper.java
+++ b/src/main/java/net/knarcraft/minigames/util/TabCompleteHelper.java
@@ -9,6 +9,7 @@ import net.knarcraft.minigames.arena.dropper.DropperArenaEditableProperty;
 import net.knarcraft.minigames.arena.parkour.ParkourArenaEditableProperty;
 import org.bukkit.Bukkit;
 import org.bukkit.Material;
+import org.bukkit.NamespacedKey;
 import org.bukkit.Tag;
 import org.bukkit.event.entity.EntityDamageEvent;
 import org.bukkit.permissions.Permission;
@@ -204,7 +205,10 @@ public final class TabCompleteHelper {
         List<String> suggestions = new ArrayList<>();
         for (Material material : Material.values()) {
             if (material.isBlock()) {
-                suggestions.add(material.getKey().getKey());
+                NamespacedKey key = material.getKeyOrNull();
+                if (key != null) {
+                    suggestions.add(key.getKey());
+                }
             }
         }
         for (Tag<Material> tag : getTags()) {
@@ -383,7 +387,7 @@ public final class TabCompleteHelper {
                 Tag.LAPIS_ORES, Tag.LEAVES, Tag.LOGS, Tag.MANGROVE_LOGS, Tag.NYLIUM, Tag.OAK_LOGS, Tag.PLANKS,
                 Tag.PORTALS, Tag.PRESSURE_PLATES, Tag.RAILS, Tag.REDSTONE_ORES, Tag.SAND, Tag.SAPLINGS, Tag.WART_BLOCKS,
                 Tag.SHULKER_BOXES, Tag.SIGNS, Tag.SLABS, Tag.SMALL_FLOWERS, Tag.SNOW, Tag.SPRUCE_LOGS, Tag.STAIRS,
-                Tag.STANDING_SIGNS, Tag.STONE_BRICKS, Tag.STONE_BUTTONS, Tag.TALL_FLOWERS, Tag.TERRACOTTA, Tag.WOOL,
+                Tag.STANDING_SIGNS, Tag.STONE_BRICKS, Tag.STONE_BUTTONS, Tag.TERRACOTTA, Tag.WOOL,
                 Tag.TRAPDOORS, Tag.WALL_CORALS, Tag.WALL_HANGING_SIGNS, Tag.WALL_SIGNS, Tag.WARPED_STEMS,
                 Tag.WOODEN_BUTTONS, Tag.WOODEN_DOORS, Tag.WOODEN_FENCES, Tag.WOODEN_PRESSURE_PLATES, Tag.WOODEN_STAIRS,
                 Tag.WOODEN_TRAPDOORS);
diff --git a/src/main/resources/plugin.yml b/src/main/resources/plugin.yml
index ce7938a..97a818d 100644
--- a/src/main/resources/plugin.yml
+++ b/src/main/resources/plugin.yml
@@ -2,7 +2,7 @@ name: MiniGames
 prefix: MiniGames
 version: '${project.version}'
 main: net.knarcraft.minigames.MiniGames
-api-version: 1.19
+api-version: 1.21
 description: A plugin that adds various mini-games
 softdepend:
   - PlaceholderAPI