Marcel searches both librarys for information on curses
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((I've been told access to the Mage's Guild library is free to the public too))
Marcel enters both the city library and the mage's guild library and looks for books about curses, more specificaly about ones that provokes sensorial changes, even more specificaly the ones about vision.
If he finds anything, he will try to collect information about rituals for lifting such curses (recquired reagents, magics, etc).