Inspiration
You can only have one of each type of inspiration at a time. This means that you can have Session Inspiration and Blessed Inspiration, but you cannot have more than one Blessed Inspiration.
Session Inspiration
You start every session with inspiration. At the end of every session, you lose your session inspiration.
Blessed Inspiration
When you roll a natural 1, you gain Blessed Inspiration. You may add 1d4 to a roll. You can do this after the die has been rolled, but before a result has been determined by the DM. At the end of every session, you lose your blessed inspiration.