This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
癴 combines the sickness radical 疒 with the phonetic component 攣, but the exact historical development is uncertain.
The sickness enclosure 疒 wraps around the complex shape 攣, suggesting a condition related to illness or wasting, but the exact meaning is unclear.
For レン, imagine a rare illness named 'Len syndrome' that causes wasting: Len -> レン, and the sickness enclosure 疒 hints at the condition.