Grudge

Grudge patch
Author	Nephi
Download	link
NetHack PatchDB	62

The Grudge Patch is a patch by Nephi written as a patch against NetHack 3.4.3 that introduces hostilities between certain monsters. Modified versions of the Grudge Patch have been incorporated into certain variants.

SLASH'EM

SLASH'EM includes the following grudges:

• All elves attack all orcs on sight (including undead), and vice versa.

UnNetHack

UnNetHack includes the following grudges:

• Quest leaders fight all monsters currently hostile to the player. Any monster currently hostile to the player will also be hostile to the quest leader.
• All angels attack all major demons on sight. All demons attack all angels on sight.
• All Nazgul attack all hobbits on sight. All hobbits attack all Nazgul on sight.
• All deep orcs attack all dwarves on sight. All dwarves attack all deep orcs on sight.
• Woodchucks will attack the Oracle on sight. The reverse is not true, but the Oracle does have both a passive defense and special behavior regarding Woodchucks, both predating this patch.
• All ravens will attack all eye-shaped monsters (Floating eyes, evil eyes, beholders (beholders are currently deferred))
• Dungeon ferns are hostile to everything, and everything is hostile to dungeon ferns.

FIQHack

FIQHack includes the following grudges:

• Quest leaders fight all monsters hostile to the player and on adjacent tiles. The reverse is also true.
• All elves attack all orcs on sight, and vice versa.
• All angels attack all major demons on sight, and vice versa.
• Woodchucks will attack the Oracle on sight. The reverse is not true, but the Oracle does have both a passive defense and special behavior regarding Woodchucks, both predating this.
• Purple worms attack shriekers on sight, as in vanilla NetHack. The reverse is not true.
• Ravens attack floating eyes on sight. The reverse is not true.
• Zombies attack the living when on adjacent tiles, and vice versa.
• Dogs attack cats when on adjacent tiles (unless they are tame), and vice versa.

Note that there is a distinction in the FIQHack code between 'grudges' (entities attack each other on sight) and 'adjacent grudges' (entities only attack each other if they are next to each other).

EvilHack

EvilHack includes the following grudges:

• Purple worms attack shriekers, as in vanilla NetHack.
• Woodchucks attack the Oracle. As with UnNetHack, the Oracle has a passive defense and special behavior for woodchucks that predate the feature.
• Ravens attack floating eyes.
• Insect-eating arachnids and centipedes attack ants, insects, xans, and grid bugs.
• Bats, giant bats and vampire bats attack flying insects and xans.
• Felines and all growth stages of pseudodragon attack sewer rats and giant rats.
• Covetous monsters and player monsters will attack whoever has the Amulet of Yendor.
• When on the Astral Plane, a monster carrying the Amulet of Yendor can attack other monsters to get away from you.
• Mind flayer larvae attack monsters that can serve as hosts, so they can mature into mind flayers.
• Neothelids attack anything that is not mindless.
• Kathryn the Ice Queen and Kathryn the Enchantress attack any monsters that have a sting attack.
• Gollum attacks piranhas, bats, giant bats, vampire bats, and orcs in order to eat their corpses.
• All pets will attack Lucifer, regardless of their level.
• Quest guardians attack all hostile monsters with the exception of other guardians or the quest leader, and vice versa.
• Elves and drow attack orcs, and vice versa.
• Elves attack drow, and vice versa.
• Angels that are not eldritch ki-rin attack demons, and vice versa.
• Zombies attack all monsters except the nonliving, and vice versa.
• White and black unicorns attack each other.
• Nazgul attack hobbits (including hobbit pickpockets and Gollum), and vice versa.
• Honey badgers attack killer bees and queen bees, and vice versa.
• Shambling horrors attack your pets, and vice versa.
• Ki-rin attack eldritch ki-rin, and vice versa.
• Mind flayers, master mind flayers and alhoons attack neothelids, and vice versa.

Grudges do not occur in the following cases, even if any of the above would apply otherwise:

• Pets do not grudge each other.
• Shopkeepers don't grudge pets.
• Soldiers don't grudge each other.
• Aligned priests who follow the same god don't grudge each other.
• The Minetown watch and resident shopkeepers and aligned priests don't grudge each other.
• Undead monsters don't grudge each other.
• berserk monsters may lash out at other adjacent monsters when attacking.

Though technically not a grudge, huge or gigantic monsters will step on tiny monsters to get to the hero, as will the Riders.