More Masteria quests + several minor fixes

Added more quests on Masteria and updated drop data in the region. Fixed
mystic door on slopes deploying players unproperly. Fixed mounts
equipped by low level players crashing the client.

wz/Quest.wz/Check.img.xml

@@ -62974,19 +62974,12 @@
   <imgdir name="8220">
     <imgdir name="0">
       <int name="npc" value="9201055"/>
-      <int name="interval" value="0"/>
       <imgdir name="quest">
         <imgdir name="0">
           <int name="id" value="8228"/>
           <int name="state" value="2"/>
         </imgdir>
       </imgdir>
-      <imgdir name="item">
-        <imgdir name="0">
-          <int name="id" value="4032018"/>
-          <int name="count" value="0"/>
-        </imgdir>
-      </imgdir>
     </imgdir>
     <imgdir name="1">
       <int name="npc" value="9201055"/>
@@ -63198,7 +63191,7 @@
       <string name="startscript" value="q8229s"/>
       <imgdir name="quest">
         <imgdir name="0">
-          <int name="id" value="8228"/>
+          <int name="id" value="8220"/>
           <int name="state" value="2"/>
         </imgdir>
       </imgdir>