This chapter is a special update sponsored by "Dreaming Back to Ancient Jiangnan".
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The contract with an elf could be considered a strange form of contact magic, with the primary point of contact being the elf's mouth. As long as it bit any part of the human body, an unbreakable contract would be established.
There was no need to break the skin, only a forceful touch was necessary.
As for the principle behind it, Liszt didn't know, and countless magicians and knights who had studied elves didn't know either. Many magicians had published their views on elf contracts in magic books, but very few actually had evidence or insight.
However, a hypothesis previously provided by Chris Truth had led him to his own deductions.
