[@Mangrale]
Its 'cause I rushed the post ^^" , Slash of Silence is basically a slash that will deal Silence. In other words if hit, the player won't be able to use any Active Skills for a few seconds, or one post (Apologies for not adding the details :X )

Dark Sight, she used it from the back lines, so it hasn't been used against Varen yet, but the effects will be more explained in the next turn I guess o.o ~