Spell Research

The standard rules allow you to perform spell research, either to create a new spell or learn an existing spell from another source. For this Kingmaker campaign the steps for spell research are as follows.
1) Pay 100 gp × the spell’s level for research costs and rare ingredients. This expense is paid at the start of each new 'week' of research. (0.5 level multiplier for cantrips)
2) Determine the total weeks of progress required to complete the research, which is equal to the spell level. (1 for cantrips) This does not need to be consecutive.
3) Determine the spell research DC, which is 10 + twice the spell’s level. (0 for cantrips)
4) Attempt a Spellcraft check and a Knowledge check (arcana for an arcane spell, religion for a divine spell) against the spell research DC. You can’t take 10 on these checks. If both checks succeed, you make 1 week’s progress toward completing the spell. When your weeks of progress equal the total number needed, the spell is completed and added to your spellbook or list of spells known.
If either or both spell research checks fail by 4 or less, you make no progress. For each check that fails by 5 or more, your research has led to poor results and you lose a week of progress toward completing the spell. (Note that as a skill check, rolling a 1 is not automatic failure if your bonus is high enough.)