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Theorycraft Grimoire

Price 10,000 gp; Slot none; CL 7th; Weight 2 lbs.; Aura faint transmutation


This grimoire, bound in dark blue leather, feels slightly electric to the touch, and words and diagrams on its pages shift slightly. A legendary wizard who has made this Spellbook their bonded item may use it to alter the properties of up to three spells which they have prepared from it. When a wizard with the Theorycraft Grimoire is bound to prepares a spell, they can change it in one of three ways:

  • Alter area of effect: If the spell prepared is a line, cone, or circular spread that emanates from the caster, you may alter the shape of the spell to another one of those shapes. This alters the radius or distance of the spell depending on the shape chosen. The length of a line spell is three times as long as the radius of the conical version of that spell, and the cone’s radius is twice as long as the radius of its spread version. To use an example, the spell lightning bolt emanates in an 120 ft. line, and thus makes a 40 ft. cone, or 20 ft. spread instead.
  • Alter affected creature type: For spells which target a specific creature type, you may alter it to target one of the following creature types: aberration, animal, fey, humanoid, magical beast, monstrous humanoid, and vermin. For example, the wizard could alter the spell hold person to become hold aberration, thus targeting aberrations instead of humanoids. Much like the original version of this spell, these may only affect the designated creature type, not both the new type and the original target type. Altering a spell in this way does not bypass any immunities a creature may have to such spells because of its creature types or subtypes. This feature cannot be used to alter any variation of the spell planar binding.
  • Alter elemental properties: A spell which deals or prevents fire, cold, electricity, or acid damage may be changed to deal or prevent the damage of a different one of these energy types. When altering the type of damage dealt, you may choose whether the spell has half of the damage dealt changed, or all of it. If there are multiple types of energy in the spell being altered, you must pick only one to alter. If the effect of a spell allows you to deal damage of a specific type as well as preventing damage of the same type, both effects must still share an energy type. This effect changes the descriptors of the spell to include the new energy type. Spells altered in this way must have the type of alteration chosen when the spell is prepared, as well as the effect of that alteration. Each altered spell may only be altered in one way, but each type of alteration may be chosen more than once.


Cost 5,000 gp; Feats Craft Wondrous Item; Spells adjustable polymorph

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