Requisites


According to the main rules:
You must use the lesser of your score in the requisite and your score in the spell’s main Technique or Form—Technique if the requisite is a Technique, Form if the requisite is a Form.

This makes most spells that require them unusable. Instead i’m putting forward the house rule:

You must have one rank in the requisite Form or Technique per five levels of the spell.

for example to full fill the Terram Requisite for Rain of Stones a lvl 20 spell you would require Terram 4.