Add a feat for slowing time inside a Circle of Exclusion.

core/ritual-magic.tex

@@ -166,6 +166,17 @@ \section{Feats}
 	Note that a \featref{circle-contain-exclude} has no open side, so you cannot cast the {\augmented} circle's rite while the barrier is up, without \featref{circle-barrier-augment-casting}.
 }
 
+\feat{Slow Time}{circle-time-slow}{10}{
+	\featref{circle-exclude}
+}{
+	You may cause your \featref{circle-exclude} to leak time, slowing time inside it.
+	If you do so, time flows up to 10 times more slowly inside the circle than outside it.
+	You must activate this effect when you cast the circle, and cannot alter it afterwards.
+
+	The duration of the circle is set from the perspective of the faster time.
+	Therefore, by default, the circle lasts 24 hours from the faster perspective, and 2 hours 24 minutes from the slower perspective.
+}
+
 \feat{Ritual Fire}{ritual-fire}{10}{
 	\noprereq
 }{