diff --git a/Source/Utility/LexiconSerializer.cpp b/Source/Utility/LexiconSerializer.cpp
new file mode 100644
index 0000000..457a33d
--- /dev/null
+++ b/Source/Utility/LexiconSerializer.cpp
@@ -0,0 +1,70 @@
+#include "Utility/LexiconSerializer.h"
+
+// FUNCTION: fn_17630
+void LexiconSerializer::Destroy(LexiconNode* node) {
+  if (node != nullptr) {
+    this->Destroy(node->child);
+    this->Destroy(node->sibling);
+    delete node;
+  }
+}
+
+// FUNCTION: fn_17633
+std::uint32_t LexiconSerializer::Serialize(LexiconNode* node, std::uint32_t offset, unsigned char terminal) {
+  int siblings = 0;
+  for (LexiconNode* current = node; current != nullptr; current = current->sibling) {
+    ++siblings;
+  }
+
+  std::uint32_t next = offset + static_cast<std::uint32_t>(siblings) * 3u + 1u;
+  while (siblings > 0) {
+    this->buffer[offset] = static_cast<unsigned char>((terminal << 7) | (next >> 16));
+    this->buffer[offset + 1] = static_cast<unsigned char>(next >> 8);
+    this->buffer[offset + 2] = static_cast<unsigned char>(next);
+    offset += 3;
+
+    unsigned char chain = 0;
+    for (LexiconNode* current = node; current != nullptr && current->sibling == nullptr; current = current->child) {
+      ++chain;
+    }
+
+    if (chain > 1) {
+      this->buffer[next++] = chain;
+      LexiconNode* current = node;
+      unsigned char lastTerminal;
+      for (int remaining = chain; remaining != 0; --remaining) {
+        this->buffer[next++] = current->value;
+        lastTerminal = current->terminal;
+        if (lastTerminal == 1) {
+          this->buffer[next++] = 2;
+        }
+
+        current = current->child;
+      }
+
+      if (current != nullptr) {
+        const unsigned char last = this->buffer[next - 1];
+        if (last >= 0x20) {
+          this->buffer[next++] = 4;
+        } else {
+          this->buffer[next - 1] = last | 4;
+        }
+
+        next = this->Serialize(current, next, lastTerminal);
+      }
+    } else {
+      this->buffer[next++] = node->value;
+      if (node->child != nullptr) {
+        next = this->Serialize(node->child, next, node->terminal);
+      } else {
+        this->buffer[next++] = 0xC0;
+      }
+    }
+
+    node = node->sibling;
+    --siblings;
+  }
+
+  this->buffer[offset] = static_cast<unsigned char>((terminal << 7) | 0x40);
+  return next;
+}
diff --git a/Source/Utility/LexiconSerializer.h b/Source/Utility/LexiconSerializer.h
new file mode 100644
index 0000000..41bcb00
--- /dev/null
+++ b/Source/Utility/LexiconSerializer.h
@@ -0,0 +1,26 @@
+#ifndef RAGNAROK_SOURCE_UTILITY_LEXICONSERIALIZER_H
+#define RAGNAROK_SOURCE_UTILITY_LEXICONSERIALIZER_H
+
+#include <cstdint>
+
+struct LexiconNode {
+  /* 0000 */ unsigned char value;
+  /* 0001 */ unsigned char terminal;
+  /* 0002 */ unsigned char unknown_0002[2];
+  /* 0004 */ LexiconNode* sibling;
+  /* 0008 */ LexiconNode* child;
+};
+
+struct LexiconSerializer {
+  /* 0000 */ std::uint32_t unknown_0000[4];
+  /* 0010 */ unsigned char* buffer;
+
+  void Destroy(LexiconNode* node);
+  std::uint32_t Serialize(LexiconNode* node, std::uint32_t offset, unsigned char terminal);
+};
+
+#if defined(_WIN32) && !defined(_WIN64)
+static_assert(sizeof(LexiconNode) == 12);
+#endif
+
+#endif
diff --git a/compile.json b/compile.json
index e60a794..83df415 100644
--- a/compile.json
+++ b/compile.json
@@ -584,6 +584,7 @@
   "Source/Utility/Base64.cpp": 0,
   "Source/Utility/GuidParse.cpp": 0,
   "Source/Utility/LexiconBoundary.cpp": 0,
+  "Source/Utility/LexiconSerializer.cpp": 0,
   "Source/Utility/MD5.cpp": 0,
   "Source/Utility/Math/AffineLookAt.cpp": 0,
   "Source/Utility/Math/AffineMatrix.cpp": 0,