update how magic works

All enhancements come from metamagic, and apply to all spheres.

Necromamancy and Polymorph simplified.

Illusion reworked as shadow-based.

gm.tex

@@ -731,6 +731,16 @@ Describe that first casting well, and the players can feel what you mean for the
 
 People who exist `in the game', know full well that different paths of magic can lead to the same effects, but they still think of the `Blessing' spell in different ways if it's cast by a priest or a dragon.
 
+\subsection{Which Things are Things?}
+
+We know that enchantment spells target people, but others spells don't have such clear boundaries.
+Conjuration spells cannot transform a person's  head without the rest -- whole people only.
+\Glspl{miracleworker} cannot cast an illusion over a window; a spell must target the entire house or nothing.
+
+Whenever boundaries become unclear, think of a word for the largest continuous object.
+Houses make a town, but they have breaks between them.
+A wall, on the other hand, cannot gain the Mage Armour spell unless the entire wall receives it.
+
 \subsection{Magical Items}
 
 \noindent

magic.tex

@@ -401,6 +401,14 @@ If items are tied, roll a die to see which regenerates \glspl{mp} first.
 	For this reason, adventuring parties cannot make use of dozens of magical items at once.
 }{}
 
+\enhancement{1}{Colorful}{Change a spell's appearance}
+
+This enhancement allows a \gls{miracleworker} to alter the appearance of any spell.
+The changes are purely cosmetic.
+\iftoggle{verbose}{%
+This can let a \textit{fireball} take the shape of a bird, or add colour to shadows, turning them into complete illusions.
+}{}
+
 \spelllevel
 
 \spell{Identify Mana}{Instant}{Empathy}{Find out which path of magic made an item}\\
@@ -431,6 +439,18 @@ If the spell targets people, one person per square is always a reasonable baseli
 
 \spelllevel
 
+\enhancement{1}{Potent}{Increase the caster's effective Intelligence Bonus by +1}
+\label{potent}
+
+A \textit{Potent} spell casts as if the mage had +1 Intelligence.
+\iftoggle{verbose}{%
+Fireballs can deal additional damage.
+A mage with +1 Intelligence could cast a Pocket Spell which activates with a +2 Bonus, and lasts for 2 scenes.
+The \textit{Wide} enhancement would 
+}{
+This includes \textit{Pocket Spells}, \textit{Talismans}, and \textit{Artefacts}.
+}
+
 \spell{Spell Breaking}{Instant}{Sphere Rating}{Destroy a spell.}\\
 The caster can destroy an existing spell, whether that spell is a persistent effect, such as a Polymorph, or a magical item.
 The spell requires an opposed roll of Intelligence + the sphere being used.
@@ -494,18 +514,6 @@ All Pocket Spells last a number of scenes equal to their \textit{Potency} (minim
 
 Any spell, from any sphere, can be targeted anywhere the mage can clearly sense, breaking all the normal range boundaries of spells.
 
-\enhancement{2}{Potent}{Increase a magical item's Potency}
-\label{potent}
-
-This enhancement increases a magical item's Potency by 1.
-\iftoggle{verbose}{%
-	A \gls{miracleworker} with Intelligence +1 would normally create \textit{Pocket Spells} which last for 1 scene, with an effective Intelligence and Wits Bonus of +1.
-	However, by casting a \textit{Pocket Spell} with this enhancement, the item gains a Potency of +2; so all rolls gain a +2 Bonus, it lasts for 2 scenes, and if the spell is cast as a \textit{Wide} spell, it covers a number of squares equal to its level +2.
-	The +2 level enhancement means the \textit{Pocket Spell} would be cast at level 7 rather than level 5, so the mage would require a Metamagic score of 7 or more.
-}{%
-	This includes \textit{Pocket Spells}, \textit{Talismans}, and \textit{Artefacts}.
-}
-
 \spelllevel
 
 \spell{Talisman}{Instant}{Academics}{Sacrifice one permanent \gls{mp} in a mana stone to let it cast a spell}
@@ -567,7 +575,7 @@ This does not affect the \emph{target} of the spell (enchanted dogs do not becom
 Sentient spells can `miss' a caster's allies, so a sentient spell to freeze over a river would target only the caster's enemies, or a \textit{Wide, Sentient Fireball} would burn only enemies.
 
 Sentient illusions can independently walk, talk, and use any languages the caster knows.
-These spells are never fully-fledged people, but simple stereotypes with stock phrases.
+These spells are never fully-fledged people, but simple, often mute, stereotypes.
 
 Sentient Force spells, such as levitation, allow a spell to independently decide where an item will be lifted, or even attack with Dancing Swords.
 However, \textit{Wide, Sentient} spells do not gain multiple consciences -- they can only focus on one thing at a time, just like a normal person.