adverbial N1 rare writtenliterary
〜の至り — the height of ~
〜の至り ・ のいたり
A full written guide for 〜の至り 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 〜の至り in real sentences
Jengo shows 〜の至り 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.