add ritual caster knack

config @ 3c4b8853

-Subproject commit 5777d89419510bbe3eab2352f13e30a7f73011c0
+Subproject commit 3c4b885324a90cdd3fc7ae6197cfd9e9fc8a4ef8

knacks.tex

@@ -127,6 +127,15 @@ They gain +1 to their Attack Bonus when using that weapon.
 
 \begin{multicols}{2}
 
+\subsubsection{Ritual Caster}
+
+A staple of dwarves and humans -- this knacks allow any caster to use Intelligence as their casting Attribute.
+It also allows the caster to spend one more \gls{mp} than usual when casting spells as a resting action.%
+\footnote{See \autopageref{restingactions}.}
+
+However, the rituals required to cast spells in this way require long periods of focus -- specifically half an hour per \gls{mp} spent.
+Casting as a resting action requires a full hour per \gls{mp} spent.
+
 \subsubsection{Snap Caster}
 
 The character is particularly adept at casting spells quickly, and therefore in Combat.