Slightly randomize the spellbook in vlad's tower

Replace the guaranteed invisibility with a somewhat high-level
spell sort-of thematical to Vlad or vampires in general

dat/tower2.lua

@@ -44,7 +44,19 @@ des.object({ id = "chest", coord = place[6],
 });
 des.object("water walking boots",place[7])
 des.object("crystal plate mail",place[8])
-des.object("spellbook of invisibility",place[9])
+
+local spbooks = {
+   "spellbook of invisibility",
+   "spellbook of cone of cold",
+   "spellbook of create familiar",
+   "spellbook of clairvoyance",
+   "spellbook of charm monster",
+   "spellbook of stone to flesh",
+   "spellbook of polymorph"
+}
+shuffle(spbooks);
+des.object(spbooks[1],place[9])
+
 -- Walls in the tower are non diggable
 des.non_diggable(selection.area(00,00,14,10))
 

doc/fixes3-7-0.txt

@@ -1364,6 +1364,7 @@ when filling quiver slot, don't bother asking "what do you want to ready?" if
 	invent is empty
 no secret doors or corridors on the first two dungeon levels
 the number of items destroyed by elemental effects is based on the damage
+randomize the spellbook in the second level of vlad's tower
 
 
 Fixes to 3.7.0-x General Problems Exposed Via git Repository