に至っては

に至っては is used to highlight an extreme, surprising, or notable example within a group or situation.

It means “when it comes to …” or “as for …”, and emphasizes that the noun represents a special or unexpected case, often stronger or worse than others.

This grammar is commonly used when:

• Giving examples that show degree or extremity

• Emphasizing that a situation has gone too far

• Adding weight to an argument or explanation

It is mainly used in written or formal Japanese, such as articles, reports, and serious discussions.