Why does everyone want me to create an alert for severity 025?
Severity 25 is a 'catch-all' fatal system error.


  A severity 25 error is a fatal system error. I have heard that
  severity 25 is more or less a catch-all for miscellaneous fatal
  errors. I have only seen this error when related to failed upgrades:
  something prevents one of the upgrade scripts from running, and a
  severity 25 error is thrown


http://sqlperformance.com/2015/04/sql-performance/dealing-with-high-severity-errors-in-sql-server