The Magic Circle
A quickened ritual is something you can cast in 1 round, instead of the normal ritual casting time. Any of the rituals you have learned can be made into a quickened version of it.
To make a quickened ritual, you write it down in your ritual book again, and at the end of it you have channelled all that magic into a footnote of sorts, reading that would have the same effect of reading & performing the entire ritual.
A quickened ritual counts as 1 level higher than normal for the ritual you are performing for determining how many pages in the ritual book it will take up.
A quickened ritual costs 50% more components to cast
Another way to cast rituals instantaneously is to read them from scrolls. When you cast rituals from scrolls, they take 1 round to cast and they cost no components, but the scroll will disappear. You do this by adding the same footnote, which costs half of what the components cost for that ritual would cost.
When you cast scrolls or quickened rituals in combat, you need 1 standard, 1 move & 1 minor action together to cast it. You may use an action point to do something else as normal, as long as you do it before ritual casting with the other actions. The ritual will be completed & come into effect at the start of your next turn as a free action.
While casting a ritual or scroll, you grant combat advantage, you can’t flank, and you can’t take opportunity actions or immediate actions.