Sol is a passive item.
- Upon defeating a boss:
- Activates the XIX - The Sun card effect.
- Fully recharges Isaac's active item.
- Grants a 2x damage multiplier and +1 luck for the rest of the floor.
- Removes any floor curses.
- Reveals the location of the Boss room on the map at all times.
- Sol is a Latin name for the Sun.
- The item's pickup quote may be a reference to DotA 2, where one of the two-player teams is called the Radiant, and "Radiant victory" is the quote heard by said team upon winning the match.
- Sol's effect may not occur after the Great Gideon fight.