diff --git a/internal/laboratory/test-traverse-fs.go b/internal/laboratory/test-traverse-fs.go
index 6dd73a6..1abb113 100644
--- a/internal/laboratory/test-traverse-fs.go
+++ b/internal/laboratory/test-traverse-fs.go
@@ -8,7 +8,6 @@ import (
 
 	nef "github.com/snivilised/nefilim"
 	"github.com/snivilised/traverse/internal/third/lo"
-	"github.com/snivilised/traverse/locale"
 )
 
 type testMapFile struct {
@@ -55,7 +54,7 @@ func (f *TestTraverseFS) Create(name string) (*os.File, error) {
 
 func (f *TestTraverseFS) MakeDir(name string, perm os.FileMode) error {
 	if !fs.ValidPath(name) {
-		return locale.NewInvalidPathError(name)
+		return nef.NewInvalidPathError("MakeDir", name)
 	}
 
 	if _, found := f.MapFS[name]; !found {
@@ -69,7 +68,7 @@ func (f *TestTraverseFS) MakeDir(name string, perm os.FileMode) error {
 
 func (f *TestTraverseFS) MakeDirAll(name string, perm os.FileMode) error {
 	if !fs.ValidPath(name) {
-		return locale.NewInvalidPathError(name)
+		return nef.NewInvalidPathError("MakeDir", name)
 	}
 
 	segments := strings.Split(name, "/")
diff --git a/locale/messages-errors.go b/locale/messages-errors.go
index ef8293d..d1e7def 100644
--- a/locale/messages-errors.go
+++ b/locale/messages-errors.go
@@ -595,194 +595,3 @@ func (td InvalidPathTemplData) Message() *i18n.Message {
 		Other:       "path: {{.Path}}",
 	}
 }
-
-type InvalidPathError struct {
-	li18ngo.LocalisableError
-	Wrapped error
-}
-
-func (e InvalidPathError) Error() string {
-	wrapped := e.Wrapped.Error()
-	path := li18ngo.Text(e.Data)
-	return fmt.Sprintf("%v, %v", wrapped, path)
-}
-
-func (e InvalidPathError) Unwrap() error {
-	return e.Wrapped
-}
-
-func NewInvalidPathError(path string) error {
-	return &InvalidPathError{
-		LocalisableError: li18ngo.LocalisableError{
-			Data: InvalidPathTemplData{
-				Path: path,
-			},
-		},
-		Wrapped: errCoreInvalidPath,
-	}
-}
-
-// ❌ CoreInvalidPathError
-
-type CoreInvalidPathErrorTemplData struct {
-	traverseTemplData
-}
-
-func IsInvalidPathError(err error) bool {
-	return errors.Is(err, errCoreInvalidPath)
-}
-
-func (td CoreInvalidPathErrorTemplData) Message() *i18n.Message {
-	return &i18n.Message{
-		ID:          "invalid-path.core-error",
-		Description: "invalid path core error",
-		Other:       "invalid path",
-	}
-}
-
-type CoreInvalidPathError struct {
-	li18ngo.LocalisableError
-}
-
-var errCoreInvalidPath = CoreInvalidPathError{
-	LocalisableError: li18ngo.LocalisableError{
-		Data: CoreInvalidPathErrorTemplData{},
-	},
-}
-
-// BOOKMARK
-
-// ❌ InvalidBinaryFsOp, can be used to adapt the non i18n nefilim.InvalidBinaryFsOp
-// error into an i18n one.
-
-type InvalidBinaryFsOpTemplData struct {
-	traverseTemplData
-	From string
-	To   string
-	Op   string
-}
-
-func (td InvalidBinaryFsOpTemplData) Message() *i18n.Message {
-	return &i18n.Message{
-		ID:          "invalid-binary-op.dynamic-error",
-		Description: "invalid binary op dynamic error",
-		Other:       "tbd: {{.Field}}",
-	}
-}
-
-type InvalidBinaryFsOpError struct {
-	li18ngo.LocalisableError
-	Wrapped error
-}
-
-func (e InvalidBinaryFsOpError) Error() string {
-	return fmt.Sprintf("%v, %v", e.Wrapped.Error(), li18ngo.Text(e.Data))
-}
-
-func (e InvalidBinaryFsOpError) Unwrap() error {
-	return e.Wrapped
-}
-
-func NewInvalidBinaryFsOpError(op, from, to string) error {
-	return &InvalidBinaryFsOpError{
-		LocalisableError: li18ngo.LocalisableError{
-			Data: InvalidBinaryFsOpTemplData{
-				From: from,
-				To:   to,
-				Op:   op,
-			},
-		},
-		Wrapped: errCoreInvalidBinaryFsOp, // replace with nefilim version
-	}
-}
-
-// ❌ CoreInvalidBinaryFsOp
-
-type CoreInvalidBinaryFsOpErrorTemplData struct {
-	traverseTemplData
-}
-
-func IsInvalidBinaryFsOpError(err error) bool {
-	return errors.Is(err, errCoreInvalidBinaryFsOp)
-}
-
-func (td CoreInvalidBinaryFsOpErrorTemplData) Message() *i18n.Message {
-	return &i18n.Message{
-		ID:          "invalid-binary-op.core-error",
-		Description: "invalid binary op core error",
-		Other:       "invalid binary op",
-	}
-}
-
-// will be replaced by nefilim.CoreInvalidBinaryFsOpError
-type CoreInvalidBinaryFsOpError struct {
-	li18ngo.LocalisableError
-}
-
-// this will be replaced by the nefilim.errCoreInvalidBinaryFsOp error
-var errCoreInvalidBinaryFsOp = CoreInvalidBinaryFsOpError{
-	LocalisableError: li18ngo.LocalisableError{
-		Data: CoreInvalidBinaryFsOpErrorTemplData{},
-	},
-}
-
-// ❌ RejectSameDirMoveError; replace with nefilim version
-
-// RejectSameDirMoveErrorTemplDataL invalid file system operation
-// that involves 2 paths, typically a source and destination.
-// The error also indicates which operation is at fault.
-type RejectSameDirMoveErrorTemplDataL struct {
-	traverseTemplData
-	From string
-	To   string
-	Op   string
-}
-
-// IsInvalidExtGlobFilterMissingSeparatorError uses errors.Is to check
-// if the err's error tree contains the core error:
-// InvalidExtGlobFilterMissingSeparatorError
-func IsRejectSameDirMoveErrorL(err error) bool {
-	return errors.Is(err, errCoreRejectSameDirMoveErrorL)
-}
-
-func NewRejectSameDirMoveErrorL(op, from, to string) error {
-	return errors.Wrap(
-		errCoreRejectSameDirMoveErrorL,
-		li18ngo.Text(RejectSameDirMoveErrorTemplDataL{
-			From: from,
-			To:   to,
-			Op:   op,
-		}),
-	)
-}
-
-// Message
-func (td RejectSameDirMoveErrorTemplDataL) Message() *i18n.Message {
-	return &i18n.Message{
-		ID:          "reject-same-dir-move.error",
-		Description: "Reject same directory move operation as this is just a rename",
-		Other:       "{{.Op}}, from: {{.From}}, to {{.To}}",
-	}
-}
-
-// ❌ CoreRejectSameDirMoveError; replace with nefilim version
-
-type CoreRejectSameDirMoveErrorTemplDataL struct {
-	traverseTemplData
-	li18ngo.LocalisableError
-}
-
-func (td CoreRejectSameDirMoveErrorTemplDataL) Message() *i18n.Message {
-	return &i18n.Message{
-		ID:          "core-reject-same-dir-move.error",
-		Description: "Core reject same directory move operation as this is just a rename",
-		Other:       "same directory move rejected; use rename instead",
-	}
-}
-
-// replace with nefilim version
-var errCoreRejectSameDirMoveErrorL = CoreRejectSameDirMoveErrorTemplDataL{
-	LocalisableError: li18ngo.LocalisableError{
-		Data: CoreRejectSameDirMoveErrorTemplDataL{},
-	},
-}