|A book describing how the mighty among summoners can bend to their will the terrible things from betwixt the planes. Many have been the unwary souls, however, who have toyed with this tome and been driven mad by unimaginable eldritch horrors.|
|a - Monstrous Menagerie||Summoning||7|
|b - Summon Greater Demon||Summoning||7|
|c - Malign Gateway||Summoning/Translocation||7|
|d - Summon Horrible Things||Summoning||8|
Prior to 0.12, failing to memorise a spell from this book could produce severe Summoning miscast effects. The Grand Grimoire was one of the books gifted by Vehumet. The followers of this god were able to read this book without the required amounts of Spellcasting and Summoning.