add emphatic caster knack

knacks.tex

@@ -138,7 +138,16 @@ Every \gls{mp} stolen in this way inflicts \pgls{ep}.
 
 These spells always look obvious, as they make the caster's nose bleed, or eyes turn pale.
 
-The \glspl{ep} heal at the normal rate, allowing the caster to regenerate their magical potential in two ways at once.
+These \glspl{ep} heal at the normal rate, allowing the caster to regenerate their magical potential in two ways at once.
+
+\subsubsection{Emphatic}
+\label{emphaticCaster}
+
+This witch weaves some words and phrases in the language of magic much better than others.
+The caster selects a spell Action and Descriptor as their focus, and those spells cost 1 fewer \glspl{mp}.
+
+For example, the spell `Carrier Crow' (\autopageref{carrierCrow}) has the invocation `Detailed, Distant, Warp Water \& Fate'.
+It costs 3~\glspl{mp}, but casters with an emphasis on `Detailed Warp' spells could cast it for 2~\glspl{mp}, or cast `Phantasm' for 1~\gls{mp}.
 
 \subsubsection{Ritual Caster}
 \label{ritualCaster}

spells.tex

@@ -506,6 +506,7 @@ A good witch leaves no part of her prey unused.
 
 \subsection{Mind}
 
+\label{carrierCrow}
 \spell{Carrier Crow}% Name
   {detailed, distant}% Enhancements
   {Warp}% Action