diff --git a/src/lib/nbt.cpp b/src/lib/nbt.cpp
index 676f45e..a10b13a 100644
--- a/src/lib/nbt.cpp
+++ b/src/lib/nbt.cpp
@@ -805,9 +805,12 @@ namespace NBT {
         }
 
         ErrorOrVoid Int8Array::removeElement(uint64_t position) {
-            #pragma message("TODO: implement")
-            //this->data.erase(position);
-            return ErrorOrVoid(true, ErrorCodes::UNIMPLEMENTED);
+            if (position >= this->data.size()) {
+                return ErrorOrVoid(true, ErrorCodes::OUT_OF_RANGE);
+            }
+
+            this->data.erase(this->data.begin()+position);
+            return ErrorOrVoid();
         }
 
         String::String() {
@@ -916,17 +919,217 @@ namespace NBT {
         }
 
         ErrorOrVoid List::deleteElement(uint64_t position) {
-            #pragma message("TODO: Implement.")
+            if (position >= this->tags.size()) {
+                return ErrorOrVoid(true, ErrorCodes::OUT_OF_RANGE);
+            }
 
-            // Step 1) delete pointer
-            // Step 2) remove element from vector
+            delete this->tags[position];
+            this->tags.erase(this->tags.begin()+position);
 
-            return ErrorOrVoid(true, ErrorCodes::UNIMPLEMENTED);
+            return ErrorOrVoid();
         }
 
         uint64_t List::length() {
             return this->tags.size();
         }
+
+        Compound::Compound() {
+            this->type = TagType::COMPOUND;
+        }
+
+        Compound::Compound(tiny_utf8::string name) {
+            this->type = TagType::COMPOUND;
+            this->name = name;
+        }
+
+        Compound::Compound(tiny_utf8::string name, std::vector<Generic*> data) {
+            this->type = TagType::COMPOUND;
+            this->name = name;
+            this->tags = data;
+        }
+
+        Compound::~Compound() {
+            for (uint64_t i=0; i<this->tags.size(); i++) {
+                delete this->tags.at(i);
+            }
+        }
+
+        ErrorOrVoid Compound::serializeWithoutHeader(std::vector<uint8_t>* rawData) {
+            for (uint64_t i=0; i<this->tags.size(); i++) {
+                ErrorOrVoid result = this->tags.at(i)->serialize(rawData);
+                if (result.isError) {
+                    return result;
+                }
+            }
+
+            return ErrorOrVoid();
+        }
+
+        ErrorOr<Generic*> Compound::getElementPointer(uint64_t position) {
+            if (position >= this->tags.size()) {
+                return ErrorOr<Generic*>(true, ErrorCodes::OUT_OF_RANGE);
+            }
+
+            return ErrorOr<Generic*>(this->tags.at(position));
+        }
+
+        ErrorOrVoid Compound::setElementPointerAt(uint64_t position, Generic* pointer) {
+            if (position >= this->tags.size()) {
+                return ErrorOrVoid(true, ErrorCodes::OUT_OF_RANGE);
+            }
+
+            delete this->tags[position];
+            this->tags[position] = pointer;
+
+            return ErrorOrVoid();
+        }
+
+        void Compound::appendPointer(Generic* pointer) {
+            this->tags.push_back(pointer);
+        }
+
+        ErrorOrVoid Compound::deleteElement(uint64_t position) {
+            if (position >= this->tags.size()) {
+                return ErrorOrVoid(true, ErrorCodes::OUT_OF_RANGE);
+            }
+
+            delete this->tags[position];
+            this->tags.erase(this->tags.begin()+position);
+
+            return ErrorOrVoid();
+        }
+
+        uint64_t Compound::length() {
+            return this->tags.size();
+        }
+
+        Int32Array::Int32Array() {
+            this->type = TagType::INT32_ARRAY;
+        }
+
+        Int32Array::Int32Array(tiny_utf8::string name, std::vector<int32_t> data) {
+            this->type = TagType::INT32_ARRAY;
+            this->name = name;
+            this->data = data;
+        }
+
+        Int32Array::Int32Array(tiny_utf8::string name, uint64_t length, int32_t data[]) {
+            this->type = TagType::INT32_ARRAY;
+            this->name = name;
+            this->data = std::vector(data, data+length);
+        }
+
+        ErrorOrVoid Int32Array::serializeWithoutHeader(std::vector<uint8_t>* rawData) {
+            Helper::writeInt32Array(rawData, this->data);
+            return ErrorOrVoid();
+        }
+
+        std::vector<int32_t> Int32Array::getData() {
+            return this->data;
+        }
+
+        ErrorOr<int32_t> Int32Array::getValue(uint64_t position) {
+            if (position >= this->data.size()) {
+                return ErrorOr<int32_t>(true, ErrorCodes::OVERRUN);
+            }
+
+            return ErrorOr<int32_t>(this->data.at(position));
+        }
+
+        void Int32Array::setData(std::vector<int32_t> newData) {
+            this->data = newData;
+        }
+
+        ErrorOrVoid Int32Array::setValue(uint64_t position, int32_t value) {
+            if (position >= this->data.size()) {
+                return ErrorOrVoid(true, ErrorCodes::OVERRUN);
+            }
+
+            this->data[position] = value;
+
+            return ErrorOrVoid();
+        }
+
+        uint64_t Int32Array::length() {
+            return this->data.size();
+        }
+
+        void Int32Array::addElement(int32_t element) {
+            this->data.push_back(element);
+        }
+
+        ErrorOrVoid Int32Array::removeElement(uint64_t position) {
+            if (position >= this->data.size()) {
+                return ErrorOrVoid(true, ErrorCodes::OUT_OF_RANGE);
+            }
+
+            this->data.erase(this->data.begin()+position);
+            return ErrorOrVoid();
+        }
+
+        Int64Array::Int64Array() {
+            this->type = TagType::INT64_ARRAY;
+        }
+
+        Int64Array::Int64Array(tiny_utf8::string name, std::vector<int64_t> data) {
+            this->type = TagType::INT64_ARRAY;
+            this->name = name;
+            this->data = data;
+        }
+
+        Int64Array::Int64Array(tiny_utf8::string name, uint64_t length, int64_t data[]) {
+            this->type = TagType::INT64_ARRAY;
+            this->name = name;
+            this->data = std::vector(data, data+length);
+        }
+
+        ErrorOrVoid Int64Array::serializeWithoutHeader(std::vector<uint8_t>* rawData) {
+            Helper::writeInt64Array(rawData, this->data);
+            return ErrorOrVoid();
+        }
+
+        std::vector<int64_t> Int64Array::getData() {
+            return this->data;
+        }
+
+        ErrorOr<int64_t> Int64Array::getValue(uint64_t position) {
+            if (position >= this->data.size()) {
+                return ErrorOr<int64_t>(true, ErrorCodes::OUT_OF_RANGE);
+            }
+
+            return ErrorOr<int64_t>(this->data[position]);
+        }
+
+        void Int64Array::setData(std::vector<int64_t> newData) {
+            this->data = newData;
+        }
+
+        ErrorOrVoid Int64Array::setValue(uint64_t position, int64_t value) {
+            if (position >= this->data.size()) {
+                return ErrorOrVoid(true, ErrorCodes::OUT_OF_RANGE);
+            }
+
+            this->data[position] = value;
+            return ErrorOrVoid();
+        }
+
+        uint64_t Int64Array::length() {
+            return this->data.size();
+        }
+
+        void Int64Array::addElement(int64_t element) {
+            this->data.push_back(element);
+        }
+
+        ErrorOrVoid Int64Array::removeElement(uint64_t position) {
+            if (position >= this->data.size()) {
+                return ErrorOrVoid(true, ErrorCodes::OUT_OF_RANGE);
+            }
+
+            this->data.erase(this->data.begin()+position);
+            return ErrorOrVoid();
+        }
+
     }
 
     bool validateRawListContents(uint8_t data[], uint64_t dataSize, uint64_t initialPosition, uint64_t* processedDataSize) {
diff --git a/src/lib/nbt.hpp b/src/lib/nbt.hpp
index ed3993c..bcd873e 100644
--- a/src/lib/nbt.hpp
+++ b/src/lib/nbt.hpp
@@ -254,8 +254,8 @@ namespace NBT {
                 ErrorOrVoid serializeWithoutHeader(std::vector<uint8_t>* rawData) override;
 
                 ErrorOr<Generic*> getElementPointer(uint64_t position);
-                ErrorOrVoid setElementPointerAt(uint64_t position, Generic*);
-                ErrorOrVoid appendPointer(Generic*);
+                ErrorOrVoid setElementPointerAt(uint64_t position, Generic* pointer);
+                void appendPointer(Generic* pointer);
                 ErrorOrVoid deleteElement(uint64_t position);
                 uint64_t length();
         };