The Bloodline Arcana for a Void-Touched Sorcerer reads as follows:
Whenever you cast an evocation spell, you may select one affected target that fails its save to suffer the choking airlessness of the void, silencing it (as silence, but affecting only the target) for 1 round. This is a supernatural ability.
This ability replaces the Starsoul Bloodline Arcana.
If this arcana is used with magic missile (an evocation spell), which has no saving throw, does the silence feature do anything?
The current assumption is that the evocation spell being used must have a saving throw in order for any possible failure to occur, to trigger silence.