connective N1 rare written
〜に至っても — even after reaching the point of ~
〜に至っても ・ にいたっても
A full written guide for 〜に至っても is on the way.
This point is mapped in the grammar tree, but its examples, formation table and usage notes haven't been written yet. The fastest way to learn it now is to meet it in real sentences inside Jengo.
See 〜に至っても in real sentences
Jengo shows 〜に至っても the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.
Study it in JengoSources Compiled from published Japanese grammar references.