You can imbue source into a spell parchment to allow you to cast that spell without consuming mana. To cast with an imbued spell parchment, you need to hold use to gather up all the source in the parchment ready to release. It takes about half a second to gather up 100 mana worth of source from the parchment, so bigger spells will take a longer time to cast.
Магическое Снаряжение
Imbued Spell Parchment
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