diff --git a/OverlayPlugin.Core/Integration/OverlayPluginLogLines.cs b/OverlayPlugin.Core/Integration/OverlayPluginLogLines.cs
new file mode 100644
index 000000000..ed55288de
--- /dev/null
+++ b/OverlayPlugin.Core/Integration/OverlayPluginLogLines.cs
@@ -0,0 +1,229 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using RainbowMage.OverlayPlugin.MemoryProcessors.InCombat;
+using RainbowMage.OverlayPlugin.NetworkProcessors;
+using RainbowMage.OverlayPlugin.Updater;
+
+namespace RainbowMage.OverlayPlugin
+{
+    using Opcodes = Dictionary<string, Dictionary<string, OpcodeConfigEntry>>;
+
+    class OverlayPluginLogLines
+    {
+        public OverlayPluginLogLines(TinyIoCContainer container)
+        {
+            container.Register(new OverlayPluginLogLineConfig(container));
+            container.Register(new LineMapEffect(container));
+            container.Register(new LineFateControl(container));
+            container.Register(new LineCEDirector(container));
+            container.Register(new LineInCombat(container));
+        }
+    }
+
+    class OverlayPluginLogLineConfig
+    {
+        private Opcodes opcodesFile;
+        private Opcodes opcodesConfig;
+        private ILogger logger;
+        private FFXIVRepository repository;
+        private PluginConfig config;
+        private TinyIoCContainer container;
+
+        private int exceptionCount = 0;
+        private const int maxExceptionsLogged = 3;
+
+        private bool haveAttemptedOpcodeDownload = false;
+
+        private const string remoteOpcodeUrl = "https://raw.githubusercontent.com/OverlayPlugin/OverlayPlugin/main/OverlayPlugin.Core/resources/opcodes.jsonc";
+
+        public OverlayPluginLogLineConfig(TinyIoCContainer container)
+        {
+            this.container = container;
+            logger = container.Resolve<ILogger>();
+            repository = container.Resolve<FFXIVRepository>();
+            config = container.Resolve<PluginConfig>();
+
+            LoadCachedOpcodesFromConfig();
+            LoadOpcodesFromFile();
+        }
+
+        private bool LoadCachedOpcodesFromConfig()
+        {
+            var versionStr = config.CachedOpcodeOverlayPluginVersion;
+            Version version;
+
+            if (versionStr == "")
+            {
+                return false;
+            }
+
+            try
+            {
+                version = new Version(versionStr);
+            }
+            catch (Exception ex)
+            {
+                LogException($"Invalid CachedOpcodeOverlayPluginVersion {versionStr}: {ex}");
+                ClearCachedOpcodes();
+                return false;
+            }
+
+            // Only load cached opcodes if we have loaded them for this version.
+            // If they're old, clear them.
+            if (repository.GetOverlayPluginVersion() > version)
+            {
+                ClearCachedOpcodes();
+                return false;
+            }
+
+            try
+            {
+                // TODO: is there a better way to go JToken -> Dictionary here without a string intermediary?
+                opcodesConfig = JsonConvert.DeserializeObject<Opcodes>(config.CachedOpcodeFile.ToString());
+            }
+            catch (Exception ex)
+            {
+                LogException($"Failed to parse cached opcodes: {ex}");
+                ClearCachedOpcodes();
+                return false;
+            }
+
+            logger.Log(LogLevel.Debug, "Loaded opcodes from config");
+            return true;
+        }
+
+        private void SaveRemoteOpcodesToConfig()
+        {
+            if (!config.UpdateCheck)
+            {
+                logger.Log(LogLevel.Debug, "Skipping remote opcode fetch due to UpdateCheck=false");
+                return;
+            }
+
+            try
+            {
+                var response = CurlWrapper.Get(remoteOpcodeUrl);
+                var jsonData = JObject.Parse(response);
+                // Validate that this can convert properly before storing it.
+                JsonConvert.DeserializeObject<Opcodes>(response);
+
+                config.CachedOpcodeFile = jsonData;
+                config.CachedOpcodeOverlayPluginVersion = repository.GetOverlayPluginVersion().ToString();
+                logger.Log(LogLevel.Debug, "Fetched remote opcodes");
+                LoadCachedOpcodesFromConfig();
+            }
+            catch (Exception ex)
+            {
+                LogException($"Remote opcode error: {ex}");
+                return;
+            }
+        }
+
+        private void ClearCachedOpcodes()
+        {
+            logger.Log(LogLevel.Debug, "Clearing cached opcodes");
+            config.CachedOpcodeOverlayPluginVersion = "";
+            config.CachedOpcodeFile = new JObject();
+        }
+
+        private bool LoadOpcodesFromFile()
+        {
+            var main = container.Resolve<PluginMain>();
+            var pluginDirectory = main.PluginDirectory;
+            var opcodesPath = Path.Combine(pluginDirectory, "resources", "opcodes.jsonc");
+
+            try
+            {
+                var jsonData = File.ReadAllText(opcodesPath);
+                opcodesFile = JsonConvert.DeserializeObject<Opcodes>(jsonData);
+                logger.Log(LogLevel.Debug, "Loaded opcodes from file");
+                return true;
+            }
+            catch (Exception ex)
+            {
+                LogException(string.Format(Resources.ErrorCouldNotLoadReservedLogLines, ex));
+                return false;
+            }
+        }
+
+        private void LogException(string message)
+        {
+            if (exceptionCount >= maxExceptionsLogged)
+                return;
+            exceptionCount++;
+            logger.Log(LogLevel.Error, message);
+        }
+
+        private IOpcodeConfigEntry GetOpcode(string name, Opcodes opcodes, string version, string opcodeType)
+        {
+            if (opcodes == null)
+                return null;
+
+            if (opcodes.ContainsKey(version))
+            {
+                var versionOpcodes = opcodes[version];
+                if (versionOpcodes.ContainsKey(name))
+                {
+                    return versionOpcodes[name];
+                }
+                else
+                {
+                    LogException($"No {opcodeType} opcode for game version {version}, opcode name {name}");
+                }
+            }
+            else
+            {
+                LogException($"No {opcodeType} opcodes for game version {version}");
+            }
+
+            return null;
+        }
+
+        public IOpcodeConfigEntry this[string name]
+        {
+            get
+            {
+                var version = repository.GetGameVersion();
+                if (version == null)
+                {
+                    LogException("Could not detect game version from FFXIV_ACT_Plugin");
+                    return null;
+                }
+
+                IOpcodeConfigEntry opcode = null;
+                opcode = GetOpcode(name, opcodesConfig, version, "config");
+                if (opcode == null)
+                {
+                    opcode = GetOpcode(name, opcodesFile, version, "file");
+
+                    // Try once to get this remotely, but only if this opcode or version is missing.
+                    // TODO: we could consider getting this once always too, but for now
+                    // if we ever have an incorrect (but present) opcode, another release is required.
+                    if (opcode == null && !haveAttemptedOpcodeDownload)
+                    {
+                        haveAttemptedOpcodeDownload = true;
+                        SaveRemoteOpcodesToConfig();
+                        return GetOpcode(name, opcodesConfig, version, "config");
+                    }
+                }
+
+                return opcode;
+            }
+        }
+    }
+    interface IOpcodeConfigEntry
+    {
+        uint opcode { get; }
+        uint size { get; }
+    }
+
+    [JsonObject(NamingStrategyType = typeof(Newtonsoft.Json.Serialization.DefaultNamingStrategy))]
+    class OpcodeConfigEntry : IOpcodeConfigEntry
+    {
+        public uint opcode { get; set; }
+        public uint size { get; set; }
+    }
+}