KanjiJLPT N1
Particularly

particularly, especially, exceptionally

Mnemonic

A lightning strike crashes down on a vermilion temple. Of all the buildings, why particularly that one? The gods were drawn to its vivid red glow, singling it out as exceptional among the dull gray rooftops.
Additional thoughts
The bright vermilion color acts like a beacon attracting the lightning — something particularly special stands out and gets struck. The red temple is distinct from every other building around it.
Quick recall
A lightning strike singles out a vermilion temple — particularly that one.

Details

The keyword for 殊 is particularly. This kanji conveys the sense of being special, exceptional, or distinct from the ordinary. It emphasizes something that stands out or differs notably from what is common or expected. By extension, it carries the adverbial meaning of "particularly" or "especially," highlighting an extraordinary degree or quality that sets something apart.
On'yomi
しゅ
Kun'yomi
こと

Used in vocab