The pure casters can research and write their own spell scrolls to add to their spell books. A number of different spells can only be gotten through research.
For each pertinent class, what it the best way to use and develop this skill? What researched spells should you be concentrating on learning? How can you develop the skill high enough to learn the right spells? Where can you find the spell materials?
Post the best strategies for researching spells, and read, rate and comment on those posted by others.