Add explanatory comments to THoT::The Underlevels.

data/campaigns/The_Hammer_of_Thursagan/scenarios/12_The_Underlevels.cfg

@@ -1,5 +1,9 @@
 #textdomain wesnoth-thot
 
+# This is the part of THoT that was designed by Taurus.  ESR did some
+# tuning and debugging afterwards, redid the flavor dialogue, and
+# added the war drums, but it's still basically Taurus's architecture.
+
 [scenario]
     name=_"The Underlevels"
     id="12_The_Underlevels"
@@ -385,6 +389,8 @@
         [/set_variable]
     [/event]
 
+    # We've arrived at the door to the sealed cave section,
+    # The door guardian gets more gold to recruit another troop wave. 
     [event]
         name=sighted
 
@@ -408,6 +414,7 @@
         [/gold]
     [/event]
 
+    # We're at the door to the sealed cave section.
     [event]
         name=moveto
         first_time_only=no
@@ -471,13 +478,24 @@
                     value=yes
                 [/set_variable]
 
+                # We defer activating the two subordinate liches in
+                # the sealed cave section until this point because we
+                # don't want the whole cave section to be already
+                # flooded with monsters when the player's troops enter
+                # it.  Ideally, we'd like the player to collide with
+                # an expanding wave of monsters from the lich to the
+                # west, and then possibly get hit from behind by
+                # monsters percolating through the narrow passage from the
+                # lich to the east.  The tunnel lengths have been tuned
+                # for this result.
                 {ACTIVATE_LICHES}
             [/then]
         [/if]
     [/event]
 
     # This event is in case the player gets a unit through the sneak tunnel
-    # before opening the sealed doors.
+    # between the spider room and the eastern lich chamber before opening 
+    # the sealed doors.
     [event]
         name=moveto
 
@@ -496,7 +514,8 @@
     [/event]
 
     # Don't active Karrag too early or all his units will run to
-    # the adjacent chamber
+    # the adjacent chamber and the final fight will just be bashing
+.   # on the guardian Draugs.
     [event]
         name=sighted