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=== Line of Forbiddance ===
[[File: Line of Forbiddance.svg|thumb|250px]]
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Since Lines of Forbiddance are resistant to being moved by Lines of Vigor, they are useful in anchoring Lines of Warding against being moved. Often a Rithmatist will use a Line of Forbiddance to connect two of a circle's bindpoints.{{ref|name=anchoring}}
A "Mark's Cross" is a set of perpendicular Lines of Forbiddance in a four-point circle. It can be attached to a bindpoint of a larger circle for support.{{ref|name=sumsion}}
A Line of
The material that a
Lines of Forbiddance are weakest at the corners if they are joined together (pg. 138).
Lines of Vigor are one of the main offensive Rithmatic lines. It is drawn in the shape of a sine wave, from the outside in. As long as it completes two intervals it will shoot out until it reaches an obstacle. Most chalklings are easily destroyed by Lines of Vigor. If it reaches a Line of Warding it will create a pockmark, if enough hit the same point than the line could be breached.{{ref|name=linesofvigorpartone}} Lines of Vigor reflect off of Lines of Forbiddance.{{ref|name=bouncingvigor}} The strength of a Line of Vigor is based on how large the curve of their wave is. A tighter curve, that puts the same amount of lines in a smaller area is harder to draw, but stronger, than one that has a longer wave.{{ref|name=linestrengths}}
Lines of Vigor generally behave like light waves{{wob ref|3155}}: they will reflect off of Lines of Forbiddance and refract upon change of medium. Higher frequency Lines are better at penetrating, while lower frequency Lines are better at energy transfer (i.e. displacing Lines of Warding).
=== Line of Making ===
The Line of Revocation is described as being a cross between a Line of Forbiddance and a Line of Vigor. It is able to interact with things not made of chalk.{{book ref|Rithmatist|23}} It is slightly more powerful than a Line of Vigor.{{book ref|Rithmatist|25}}
This line was completely unknown before the events of the book. It was
== Teaching Rithmatics ==
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