From Ars Magica
There are four types of chalk in Ars Magica that allow one to scrawl a mark on the floor in certain circumstances. In order to work, they must be written on a 3x3 flat area. Some marks must be accompanied by pillars of a specific type in order to function.
- Red Chalk is used to create a Dark Nexus, which converts mobs into Raw Essence
- White Chalk is used to create a Light Nexus, which draws Raw Essence from the environment
- Blue Chalk is used to create an Essence Nexus, which converts items into Raw Essence
- Purple Chalk is used to create a Null Magic Rune, which prevents spells from being cast in its vicinity.
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