diff --git a/build.gradle.kts b/build.gradle.kts
index 596c735..0b0dd50 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -35,9 +35,11 @@ subprojects {
   }
 }
 
+val paperServerVersion: String = project.properties["paperServerVersion"]?.toString() ?: "1.18"
+
 concrete {
   minecraftServerPath.set("server")
-  paperServerVersionGroup.set("1.18")
+  paperServerVersionGroup.set(paperServerVersion)
   paperApiVersion.set("1.18.2-R0.1-SNAPSHOT")
   acceptServerEula.set(true)
 }
diff --git a/foundation-core/src/main/kotlin/gay/pizza/foundation/core/FoundationCorePlugin.kt b/foundation-core/src/main/kotlin/gay/pizza/foundation/core/FoundationCorePlugin.kt
index 2da2c1e..a71fdf7 100644
--- a/foundation-core/src/main/kotlin/gay/pizza/foundation/core/FoundationCorePlugin.kt
+++ b/foundation-core/src/main/kotlin/gay/pizza/foundation/core/FoundationCorePlugin.kt
@@ -1,7 +1,5 @@
 package gay.pizza.foundation.core
 
-import gay.pizza.foundation.shared.IFoundationCore
-import gay.pizza.foundation.shared.PluginMainClass
 import gay.pizza.foundation.core.abstraction.FoundationPlugin
 import gay.pizza.foundation.core.features.backup.BackupFeature
 import gay.pizza.foundation.core.features.dev.DevFeature
@@ -12,7 +10,8 @@ import gay.pizza.foundation.core.features.scheduler.SchedulerFeature
 import gay.pizza.foundation.core.features.stats.StatsFeature
 import gay.pizza.foundation.core.features.update.UpdateFeature
 import gay.pizza.foundation.core.features.world.WorldFeature
-import gay.pizza.foundation.shared.PersistentStore
+import gay.pizza.foundation.shared.IFoundationCore
+import gay.pizza.foundation.shared.PluginMainClass
 import gay.pizza.foundation.shared.PluginPersistence
 import org.koin.dsl.module
 import java.nio.file.Path
diff --git a/foundation-core/src/main/kotlin/gay/pizza/foundation/core/features/backup/BackupCommand.kt b/foundation-core/src/main/kotlin/gay/pizza/foundation/core/features/backup/BackupCommand.kt
index b2edec4..54a247c 100644
--- a/foundation-core/src/main/kotlin/gay/pizza/foundation/core/features/backup/BackupCommand.kt
+++ b/foundation-core/src/main/kotlin/gay/pizza/foundation/core/features/backup/BackupCommand.kt
@@ -2,7 +2,7 @@ package gay.pizza.foundation.core.features.backup
 
 import gay.pizza.foundation.shared.Platform
 import gay.pizza.foundation.core.FoundationCorePlugin
-import gay.pizza.foundation.core.Util
+import gay.pizza.foundation.shared.MessageUtil
 import net.kyori.adventure.text.Component
 import net.kyori.adventure.text.format.TextColor
 import org.bukkit.Server
@@ -27,14 +27,14 @@ import java.util.zip.ZipOutputStream
 // TODO: Clean up dependency injection.
 class BackupCommand(
   private val plugin: FoundationCorePlugin,
-  private val backupsPath: Path,
+  private val backupFilePath: Path,
   private val config: BackupConfig,
   private val s3Client: S3Client,
 ) : CommandExecutor {
   override fun onCommand(
     sender: CommandSender, command: Command, label: String, args: Array<String>
   ): Boolean {
-    if (RUNNING.get()) {
+    if (running.get()) {
       sender.sendMessage(
         Component
           .text("Backup is already running.")
@@ -52,10 +52,10 @@ class BackupCommand(
 
   // TODO: Pull backup creation code into a separate service.
   private fun runBackup(server: Server, sender: CommandSender? = null) = try {
-    RUNNING.set(true)
+    running.set(true)
 
     server.scheduler.runTask(plugin) { ->
-      server.sendMessage(Util.formatSystemMessage("Backup started."))
+      server.sendMessage(MessageUtil.formatSystemMessage("Backup started."))
     }
 
     val backupTime = Instant.now()
@@ -65,7 +65,7 @@ class BackupCommand(
       backupTime.toString()
     }
     val backupFileName = String.format("backup-%s.zip", backupIdentifier)
-    val backupPath = backupsPath.resolve(backupFileName)
+    val backupPath = backupFilePath.resolve(backupFileName)
     val backupFile = backupPath.toFile()
 
     FileOutputStream(backupFile).use { zipFileStream ->
@@ -94,9 +94,9 @@ class BackupCommand(
     }
     plugin.slF4JLogger.warn("Failed to backup.", e)
   } finally {
-    RUNNING.set(false)
+    running.set(false)
     server.scheduler.runTask(plugin) { ->
-      server.sendMessage(Util.formatSystemMessage("Backup finished."))
+      server.sendMessage(MessageUtil.formatSystemMessage("Backup finished."))
     }
   }
 
@@ -140,7 +140,7 @@ class BackupCommand(
       .filter { path -> !matchers.any { it.matches(Paths.get(path.normalize().toString())) } }
       .toList()
     val buffer = ByteArray(16 * 1024)
-    val backupsPath = backupsPath.toRealPath()
+    val backupsPath = backupFilePath.toRealPath()
 
     for (path in paths) {
       val realPath = path.toRealPath()
@@ -163,6 +163,6 @@ class BackupCommand(
   }
 
   companion object {
-    private val RUNNING = AtomicBoolean()
+    private val running = AtomicBoolean()
   }
 }
diff --git a/foundation-core/src/main/kotlin/gay/pizza/foundation/core/features/backup/BackupFeature.kt b/foundation-core/src/main/kotlin/gay/pizza/foundation/core/features/backup/BackupFeature.kt
index 677df3c..5867686 100644
--- a/foundation-core/src/main/kotlin/gay/pizza/foundation/core/features/backup/BackupFeature.kt
+++ b/foundation-core/src/main/kotlin/gay/pizza/foundation/core/features/backup/BackupFeature.kt
@@ -28,7 +28,7 @@ class BackupFeature : Feature() {
     registerCommandExecutor("fbackup", BackupCommand(plugin, backupPath, config, s3Client))
 
     if (config.schedule.cron.isNotEmpty()) {
-      // Assume user never wants to modify second. I'm not sure why this is enforced in Quartz.
+      // Assume the user never wants to modify the second. I'm not sure why this is enforced in Quartz.
       val expr = "0 ${config.schedule.cron}"
       scheduleId = scheduler.cron(expr) {
         plugin.server.scheduler.runTask(plugin) { ->
diff --git a/foundation-core/src/main/kotlin/gay/pizza/foundation/core/features/stats/StatsFeature.kt b/foundation-core/src/main/kotlin/gay/pizza/foundation/core/features/stats/StatsFeature.kt
index 8a7e32f..6e2e23c 100644
--- a/foundation-core/src/main/kotlin/gay/pizza/foundation/core/features/stats/StatsFeature.kt
+++ b/foundation-core/src/main/kotlin/gay/pizza/foundation/core/features/stats/StatsFeature.kt
@@ -11,6 +11,7 @@ import org.bukkit.event.EventHandler
 import org.koin.core.component.inject
 import java.time.Instant
 
+@Suppress("IdentifierGrammar")
 class StatsFeature : Feature() {
   internal val persistence = inject<PluginPersistence>()
   private lateinit var chatLogStore: PersistentStore
diff --git a/foundation-core/src/main/kotlin/gay/pizza/foundation/core/Util.kt b/foundation-shared/src/main/kotlin/gay/pizza/foundation/shared/MessageUtil.kt
similarity index 92%
rename from foundation-core/src/main/kotlin/gay/pizza/foundation/core/Util.kt
rename to foundation-shared/src/main/kotlin/gay/pizza/foundation/shared/MessageUtil.kt
index 33869bc..1349d70 100644
--- a/foundation-core/src/main/kotlin/gay/pizza/foundation/core/Util.kt
+++ b/foundation-shared/src/main/kotlin/gay/pizza/foundation/shared/MessageUtil.kt
@@ -1,9 +1,9 @@
-package gay.pizza.foundation.core
+package gay.pizza.foundation.shared
 
 import net.kyori.adventure.text.Component
 import net.kyori.adventure.text.format.TextColor
 
-object Util {
+object MessageUtil {
   private val leftBracket: Component = Component.text('[')
   private val rightBracket: Component = Component.text(']')
   private val whitespace: Component = Component.text(' ')
diff --git a/foundation-shared/src/main/kotlin/gay/pizza/foundation/shared/ServerExtensions.kt b/foundation-shared/src/main/kotlin/gay/pizza/foundation/shared/ServerExtensions.kt
index c32190b..b6c7f83 100644
--- a/foundation-shared/src/main/kotlin/gay/pizza/foundation/shared/ServerExtensions.kt
+++ b/foundation-shared/src/main/kotlin/gay/pizza/foundation/shared/ServerExtensions.kt
@@ -9,7 +9,7 @@ import org.bukkit.entity.EntityType
 val Server.allPlayers: List<OfflinePlayer>
   get() = listOf(onlinePlayers, offlinePlayers.filter { !isPlayerOnline(it) }.toList()).flatten()
 
-fun Server.isPlayerOnline(player: OfflinePlayer) =
+fun Server.isPlayerOnline(player: OfflinePlayer): Boolean =
   onlinePlayers.any { onlinePlayer -> onlinePlayer.name == player.name }
 
 fun Server.allPlayerStatisticsOf(
@@ -17,7 +17,7 @@ fun Server.allPlayerStatisticsOf(
   material: Material? = null,
   entityType: EntityType? = null,
   order: SortOrder = SortOrder.Ascending
-) = allPlayers.map { player ->
+): List<Pair<OfflinePlayer, Int>> = allPlayers.map { player ->
   player to if (material != null) {
     player.getStatistic(statistic, material)
   } else if (entityType != null) {
diff --git a/foundation-core/src/main/kotlin/gay/pizza/foundation/core/TextColors.kt b/foundation-shared/src/main/kotlin/gay/pizza/foundation/shared/TextColors.kt
similarity index 78%
rename from foundation-core/src/main/kotlin/gay/pizza/foundation/core/TextColors.kt
rename to foundation-shared/src/main/kotlin/gay/pizza/foundation/shared/TextColors.kt
index 19439d5..1a22ac7 100644
--- a/foundation-core/src/main/kotlin/gay/pizza/foundation/core/TextColors.kt
+++ b/foundation-shared/src/main/kotlin/gay/pizza/foundation/shared/TextColors.kt
@@ -1,4 +1,4 @@
-package gay.pizza.foundation.core
+package gay.pizza.foundation.shared
 
 import net.kyori.adventure.text.format.TextColor