Unlike ordinary spiders, an Arachne's moulting process was far more complicated.
The dense chitin exoskeleton protecting their arachnid half couldn't naturally expand once hardened. Their human upper body, however, possessed flexible flesh, skin, and softer adaptive plating capable of growth and change.
The mismatch between the two halves created constant strain during maturation.
Each moult became a dangerous transitional period.
As the human half developed, forcing their spider abdomen and legs to shed their rigid shell to accommodate the increase in mass. But unlike true spiders, an Arachne's partially humanoid physiology disrupted the instinctive efficiency of the process.
Their larger size, heavier musculature, and hybrid nervous system made splitting and escaping the old exoskeleton painfully slow.
Asmodeus listened carefully to his wife's explanation, Lumina's inflamed skin a result of incorrect moulting.
