From ErfWiki

Proposed Canon

"You don't fight Fate, you help it!"

Strengths: Predicting Major Events, Long Term Planning

Weaknesses: Public Opinion

First Appearance: TBFGK 147 (in flashback) LIAB Text 37 (speaking)

Marie was a Predictamancer in service to Faq. After her side fell, she went to the Magic Kingdom where she began working with Janis to mastermind the creation of the Perfect Warlord spell. Janis believes that Marie shares her desire to permanently end war on Erfworld, but Marie's true objectives have yet to be revealed.

Successful predictions

• That Faq would fall some day.^Erf-b1-p082
• The order in which cities of Faq needed to be veiled by Jack the Foolamancer.^Erf-b1-p107
• Wanda's attunement to an Arkentool.^Erf-b1-p143
• That Sizemore is about to return to the Magic Kingdom ^LIAB_Text_37.

Real World References

Her name may be a reference to Marie Laveau, an 18th century voudoun priestess from New Orleans.

Her last name of Lavraie is french for "the true one".