You can't take 20 on rituals.
Dispel Magic (Utility 6) doesn't work against Magic Circle, because:
a) Magic Circle doesn't create a Conjuration or Zone.
b) "An affected creature ... cannot affect the boundary in any way".
You can't take 20 on rituals.
Dispel Magic (Utility 6) doesn't work against Magic Circle, because:
a) Magic Circle doesn't create a Conjuration or Zone.
b) "An affected creature ... cannot affect the boundary in any way".