Lolth will be peaceful towards Drow players under the right circumstances.

If the player is Drow, stay true to their alignment (chaotic), and are
at least fervently aligned (9 or greater), Lolth will be peaceful
towards them.

This now makes me think that under the same conditions, if a chaotic
Drow player kills Lolth, there should be some sort of harsh penalty,
seeing as how she is their deity and all. Hmm.

Author: k21971

doc/evilhack-changelog.md

@@ -3400,4 +3400,6 @@ The following changes to date are:
 - Hippocrates (Healer quest leader) additional gear
 - Fix: certain monster steeds should only be ridden by certain monster
   riders
+- Lolth will be peaceful towards Drow players under the right
+  circumstances
 

src/makemon.c

@@ -3961,15 +3961,21 @@ register struct monst *mtmp;
         return TRUE;
 
     /* Major demons will sometimes be peaceful to unaligned Infidels.
-     * They must pass this 50% check, then the 50% check for chaotics
-     * being non-hostile to unaligned, then the usual check for coaligned.
-     * For crowned Infidels, the random check is bypassed */
+       They must pass this 50% check, then the 50% check for chaotics
+       being non-hostile to unaligned, then the usual check for coaligned.
+       For crowned Infidels, the random check is bypassed. Followers of
+       Lolth - if they are Drow, stay chaotic, and are at least fervently
+       aligned, she will spawn peaceful */
     if (always_hostile(ptr)) {
         if (Role_if(PM_INFIDEL) && is_demon(ptr)
-            && (u.uevent.uhand_of_elbereth || rn2(2)))
+            && (u.uevent.uhand_of_elbereth || rn2(2))) {
             return TRUE;
-        else
+        } else if (ptr == &mons[PM_LOLTH] && ual == A_CHAOTIC
+            && u.ualign.record >= 9 && Race_if(PM_DROW)) {
+            return TRUE;
+        } else {
             return FALSE;
+        }
     }
 
     if (ptr->msound == MS_LEADER || ptr->msound == MS_GUARDIAN)
@@ -3989,26 +3995,25 @@ register struct monst *mtmp;
         return FALSE;
 
     /* the monster is hostile if its alignment is different from the
-     * player's */
+       player's */
     if (sgn(mal) != sgn(ual))
         return FALSE;
 
-    /* Not all chaotics support Moloch.  This goes especially for elves. */
+    /* Not all chaotics support Moloch.  This goes especially for elves */
     if (ual == A_NONE && (racial_elf(mtmp) || rn2(2)))
         return FALSE;
 
-    /* Chaotic monsters hostile to players with Amulet, except Infidels. */
+    /* Chaotic monsters hostile to players with Amulet, except Infidels */
     if (mal < A_NEUTRAL && u.uhave.amulet && !Role_if(PM_INFIDEL))
         return FALSE;
 
     /* minions are hostile to players that have strayed at all */
     if (is_minion(ptr))
         return (boolean) (u.ualign.record >= 0);
 
-    /* Last case:  a chance of a co-aligned monster being
-     * hostile.  This chance is greater if the player has strayed
-     * (u.ualign.record negative) or the monster is not strongly aligned.
-     */
+    /* Last case: a chance of a co-aligned monster being
+       hostile. This chance is greater if the player has strayed
+       (u.ualign.record negative) or the monster is not strongly aligned */
     return (boolean) (!!rn2(16 + (u.ualign.record < -15 ? -15
                                                         : u.ualign.record))
                       && !!rn2(2 + abs(mal)));