diff --git a/rules/spells.tex b/rules/spells.tex
index c43eb1af97e50098044c9c214575ecde986a8a5c..030e06dd06a578a54a861749e22fd022fb13c7f3 100644
--- a/rules/spells.tex
+++ b/rules/spells.tex
@@ -1,26 +1,27 @@
 \subsubsection*{Spells}
 \begin{itemize}
   \item
-  To cast a spell, roll Charisma plus the Skill which the spell requires.
-  The spell will state the \gls{tn} and \gls{mp} cost.
+  To cast a spell, roll Charisma plus the Sphere used to cast the spell.
   \item
-  Casters can spend a number of \glspl{mp} equal to the highest sphere they are using to cast a spell.
+  The spell's level is the \gls{mp} cost, and the \gls{mp} cost is the level.
   \item
-  Casters without \glspl{mp} lose \glspl{fatigue} instead.
-  \item
-  A failed spell rips double the normal \glspl{mp} from the caster.
+  The target determines the spell's \gls{tn}.
+  Hard rocks resist shattering, and small rivers will not flood easily.
+  \begin{itemize}
+    \item
+    When spells affect a creature, the creature may also resist by dodging rocks, or ignoring mental suggestions from the Mind Sphere, et c.
+    \item
+    If the spell has two \glspl{tn}, the highest applies, then half of the second-highest, and so on.
+  \end{itemize}
   \item
-  Some spell \glspl{ingredient}, pulled from the heart of a plant, or the guts of an animal, can boost a caster's Sphere level by +1 for a single moment.
+  Casters without \glspl{mp} lose \glspl{fatigue} instead.
   \item
   Spells cannot target something too far below their range.
   \begin{itemize}
     \item
     Spells which target something a few steps away can target anything, even within touching distance.
     \item
-    Spells which target something a stone's throw away cannot target something nearby.
-    \item
-    Spells which target within shouting distance cannot affect anything within a stone's throw.
-    \item
-    Finally, spells which target anything within line of sight cannot target target anything in shouting distance.
+    Spells which target something 'a stone's throw' away cannot target anything nearby.
+    Spells which target within shouting distance cannot affect anything within a stone's throw, and so on.
   \end{itemize}
 \end{itemize}