Effort is the most important resource. It is a measure of your life force, stamina, and determination. It is used to pay for many of your Actions and, most importantly, to Attack monsters. There are three categories of Effort: Small , Medium , Large .
Each category is a distinct resource and is spent independently. However, you can spend Effort of a higher category in place of Effort of a lower category. To do so would be a desperate measure, but might just save your life! If you ever have to lose Effort but do not have enough — you lose the game.
You can spend effort of a smaller category to gain effort of a higher category using the actions Focus and Inspiration.