lawful minions vs Demonbane

Back then Demonbane was a long sword, lawful Angels and Archons
could get either it or Sunsword as part of their starting equipment.
After it got changed into a mace instead, they could only get
Sunsword.  Rather than always giving them a long sword, sometimes
give them a mace so that they get back the chance to start with
Demonbane.

Since mace is quite a bit weaker that long sword against large
opponents, provide a better enchantment for maces given to lawful
minions.

src/makemon.c

@@ -329,20 +329,27 @@ m_initweap(struct monst *mtmp)
 
     case S_ANGEL:
         if (humanoid(ptr)) {
-            /* create minion stuff; can't use mongets */
+            /* create minion stuff; can't use mongets;
-            otmp = mksobj(LONG_SWORD, FALSE, FALSE);
+               weapon: long sword [rn2(5) > 1 == 60%] or mace [40%] */
-
+            otmp = mksobj((rn2(5) > 1) ? LONG_SWORD : MACE, FALSE, FALSE);
-            /* maybe make it special */
+            /* maybe promote weapon to an artifact */
             if ((!rn2(20) || is_lord(ptr))
                  && sgn(mtmp->isminion ? EMIN(mtmp)->min_align
-                                       : ptr->maligntyp) == A_LAWFUL)
+                                       : ptr->maligntyp) == A_LAWFUL) {
-                /* [note: this used to have a 50:50 chance for Sunsword or
+                /* Sunsword and Demonbane both used to be long swords and
-                   Demonbane, but Demonbane has been changed into a mace] */
+                   Angels always got a long sword, so might get either of
-                otmp = oname(otmp, artiname(ART_SUNSWORD),
+                   the two artifacts; Demonbane has been changed to be a
+                   mace; this deliberately makes an independent choice of
+                   which artifact and if it picks the wrong name for 'otmp's
+                   type, then 'otmp' won't be upgraded into an artifact */
+                otmp = oname(otmp, artiname((rn2(5) > 1) ? ART_SUNSWORD
+                                                         : ART_DEMONBANE),
                              ONAME_RANDOM); /* randomly created */
+            }
             bless(otmp);
             otmp->oerodeproof = TRUE;
-            otmp->spe = rn2(4);
+            /* make long sword be +0 to +3, weaker mace be +3 to +6 */
+            otmp->spe = (otmp->otyp == LONG_SWORD) ? rn2(4) : rn1(4, 3);
             (void) mpickobj(mtmp, otmp);
 
             otmp = mksobj(!rn2(4) || is_lord(ptr) ? SHIELD_OF_REFLECTION