The stone by night spell turns those affected to stone at night. Like most magic, it only effected those who could both see and hear the spell being cast. This spell can only be broken when the sky burns.
Stone By Night Spell
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Effect
Incantation
Latin
Omnes conspecti,omnes auditi,
in nocte usque ad saxum commutate
dum caelum ardeat
English
All who see this,all who hear this,
turn to stone throughout the night
until the skies burn