Frozen Plains of Breshavani

Arcanoloth named Torun who is desperate for stories, and will offer the party a safe place to rest, where outside influence will not harm them in exchange for those stories.

Can see fiery horses (Nightmares) in the distance, traveling as a pack, moving across the snow, winking in out of out of existence, reappearing intermittently, and casting light.

The spectral dogs, the Anasazi, run alongside the horses for a short time, barking laughter as they nip at the legs of the woolystangs.

Will o Wisps in the distance illuminate a tempting path

An Air Elemental dances in the storm on its own singing a song of strong storms and the changes the wind brings.

3 Starving Polar Bears come to eat horses.

2 Giant Elk and 6 Elk stampede

12 Nupperibo

2 Shadow Demons

Avalanche, strength save by the horses to stay atop the floating snow, dex save by the riders to stay atop the horses.

Dexterity saves as the ground crumbles and slides the party down at a steep angle, causing minimal damage. The party falls into a vast and ancient ruin, now collapsed, and all that remains is a door which says in ancient Celestial script, "In the Weave of Creation's delicate design, Evil and Chaos weave their intricate lines, as mortal souls abide without divine spark, tested, they choose, path of Light or path of Dark. In this realm, mankind's true nature tested, to earn the gaze of Gods who have rested on man's true virtues, All Future's vested"

1 Winter Wolf, 5 Dire Wolves

1 Vrock and 2 Vargouille

2 Bearded Devil, 1 Hell Hound, 9 Lemures

1 Barlgura, 2 Bulezau

1 Bearded Devil, 11 Imps.

2 Barbed Devils, 12 Lemures

The distant lights of an inn can be seen, while poorly cared for, the lights are bright, the streets empty, and only a few people inside. 2 Tieflings, and 2 Imps disguised as raven, rat or spider. the inn is a brothel, they try to bang the party, and they're actually Succubus/Incubus.

1 Water Elemental, 5 Ice Mephits, as the Water Elemental loses 1/4 of its health, it spawns 1d4 more Ice Mephits.

1 Hezrou.

1 Cambion, 3 Imps, 10 Lemures

20 Dretch's start with Fetid Cloud under foot, accompanied by 20 Manes

Heavy Sleet Storm (Strong Winds + Precipitation) Disadvantage on ranged attacks, disadvantage on perception (including hearing) and lightly obscures. Difficult terrain caused by thick ice, DC 10 Dex save or prone. Lasts 1d4+1 hours.

1 Barghest, 9 Maw Demon

1 Glabrezu

1 Abominable Yeti