Shadows of Montmartre
Corwin's Pattern was drawn in the Patternfall War. Since Le Schisme it has been erratic in its effects and hazardous to those who attempt to use it. As a result, the Elder Generation has essentially ceased trying to engage it. Most of them believe that intentional damage to Corwin's Pattern is what precipitated Le Schisme.
The Dryad is the totem animal of Corwin's Pattern, just as The Unicorn is the totem of Dworkin's Pattern.