diff --git a/spectacles/cli.py b/spectacles/cli.py
index 8943550d..e2db9a6a 100644
--- a/spectacles/cli.py
+++ b/spectacles/cli.py
@@ -529,7 +529,7 @@ def _build_lookml_subparser(
     )
     subparser.add_argument(
         "--severity",
-        choices=["info", "warning", "error"],
+        choices=["success", "info", "warning", "error", "fatal"],
         default="warning",
         help=(
             "Specify a level of validation error severity to trigger test failure. "
diff --git a/spectacles/printer.py b/spectacles/printer.py
index 448ed17a..53099e7f 100644
--- a/spectacles/printer.py
+++ b/spectacles/printer.py
@@ -93,11 +93,11 @@ def print_lookml_error(
 ) -> None:
     if file_path is None:
         file_path = "[File name not given by Looker]"
-    header_color = yellow if severity == "warning" else red
+    header_color = red if severity in ("fatal", "error") else yellow
     print_header(
         header_color(f"{file_path}:{line_number}"), LINE_WIDTH + COLOR_CODE_LENGTH
     )
-    wrapped = textwrap.fill(f"{severity.title()}: {message}", LINE_WIDTH)
+    wrapped = textwrap.fill(f"[{severity.title()}] {message}", LINE_WIDTH)
     logger.info(wrapped)
     if lookml_url:
         logger.info("\n" + f"LookML: {lookml_url}")
diff --git a/spectacles/validators/lookml.py b/spectacles/validators/lookml.py
index e1892a3c..112a556c 100644
--- a/spectacles/validators/lookml.py
+++ b/spectacles/validators/lookml.py
@@ -3,10 +3,19 @@
 from spectacles.exceptions import LookMLError
 
 # Define constants for severity levels
+SUCCESS = 0
 INFO = 10
 WARNING = 20
 ERROR = 30
-NAME_TO_LEVEL = {"info": INFO, "warning": WARNING, "error": ERROR}
+FATAL = 40
+
+NAME_TO_LEVEL = {
+    "success": SUCCESS,
+    "info": INFO,
+    "warning": WARNING,
+    "error": ERROR,
+    "fatal": FATAL,
+}
 
 
 class LookMLValidator:
@@ -22,7 +31,7 @@ def __init__(self, client: LookerClient):
         self.client = client
 
     def validate(self, project: str, severity: str = "warning") -> Dict[str, Any]:
-        severity_level = NAME_TO_LEVEL[severity]
+        severity_level: int = NAME_TO_LEVEL[severity]
         validation_results = self.client.lookml_validation(project)
         errors = []
         lookml_url: Optional[str] = None