Courier Horse

The Courier Horse is a type of NPC in Lust Grimm and LustGrimm Again that provides quick transportation.

Description
Courier Horses act as a means of quick transport. Talking to a Courier Horse gives the option of instantly traveling to another location. In general, once the player reaches the end of a dungeon, they will find a Courier Horse there who can take them back to the dungeon entrance. This will unlock a second Courier Horse at the entrance, who will now give the option of instantly traveling to the end of the dungeon. The service is completely free of charge. In some cases, the Courier Horse is one way: there is a horse at the end of a dungeon, but talking to them won't unlock a second horse at the entrance.

Lust Grimm
In this game, the player can also use various options to rudely refuse service, verbally abuse, or even threaten the horses with violence. This seems to have been implemented for no reason other than being cruel for amusement.

There is a horse NPC in Lacrima Village called "Horse in Despair" that dashes up and down while spinning and screams about life being terrible when spoken to. It is implied from another nearby horse NPC that this is a Courier Horse pushed to the brink of sanity from continual abuse. Another horse in the Animal Forest says that they're a Courier Horse that retired to get away from the abuse.

Courier Horses can be found in Mount Munagoto, Insomnia Cave, Daydream Tower, Elisha Cave and Awilda Cave. The last two of these only go one way.

LustGrimm Again
Courier Horses in this game are no longer named and no longer have the option to abuse them, but still provide transport.