Make hezrous stink

dat/data.base

@@ -2207,7 +2207,8 @@ hermes
 	numbers, the alphabet, weights and measures, and sacrificing.
 hezrou
 	"Hezrou" is the common name for the type II demon.  It is
-	among the weaker of demons, but still quite formidable.
+	among the weaker of demons, but still quite formidable,
+	mostly due to the stench.
 hippocrates
 	Greek physician, recognized as the father of medicine.  He
 	is believed to have been born on the island of Cos, to have

doc/fixes37.0

@@ -100,6 +100,7 @@ fix attached ball getting deallocated if swallowed, going down into a pit,
 level compiler creates correct novel with supplied name
 for farlook, describe water in the castle moat and in Juiblex's swamp as moat
 	and as swamp, respectively, rather than just as "water"
+make hezrous emit poison clouds when they move
 
 
 Fixes to 3.7.0-x Problems that Were Exposed Via git Repository

include/mondata.h

@@ -27,6 +27,8 @@
 #define resists_ston(mon) \
     ((((mon)->data->mresists | (mon)->mextrinsics) & MR_STONE) != 0)
 
+#define immune_poisongas(ptr) ((ptr) == &mons[PM_HEZROU])
+
 #define is_lminion(mon) \
     (is_minion((mon)->data) && mon_aligntyp(mon) == A_LAWFUL)
 #define is_flyer(ptr) (((ptr)->mflags1 & M1_FLY) != 0L)

src/mon.c

@@ -145,9 +145,9 @@ struct monst *mtmp;
     int px, py;
     boolean is_you = (mtmp == &g.youmonst);
 
-    /* Non living and non breathing monsters are not concerned */
+    /* Non living, non breathing, immune monsters are not concerned */
     if (nonliving(mtmp->data) || is_vampshifter(mtmp)
-        || breathless(mtmp->data))
+        || breathless(mtmp->data) || immune_poisongas(mtmp->data))
         return M_POISONGAS_OK;
     /* not is_swimmer(); assume that non-fish are swimming on
        the surface and breathing the air above it periodically

src/monmove.c

@@ -623,6 +623,9 @@ register struct monst *mtmp;
     /*  Now the actual movement phase
      */
 
+    if (mtmp->data == &mons[PM_HEZROU]) /* stench */
+        create_gas_cloud(mtmp->mx, mtmp->my, 1, 8);
+
     if (mdat == &mons[PM_KILLER_BEE]
         /* could be smarter and deliberately move to royal jelly, but
            then we'd need to scan the level for queen bee in advance;