D&D 5E Chathus, the city at the wasteland's hollow heart

TL;DR
[sblock]There's a ruined city in a collapsed canyon, where undead and a few fiends serve a medusa necromancer who guards the first book of Creation. Help me freak out my 6th level party.[/sblock]

Vignette One: Orcs ambush the party in the mountains two days outside of their home town. The PCs manage to kill one before he leaves the tree line. They finish the rest of the battle, treat their wounded. When they go to loot the one orc in the woods, they find his body has been dragged away.

Vignette Two: Weeks later, en route to a ruin they want to explore, the party spots a white figure across a river. It's too far to catch up to, but they end up crossing the river and camping. They can't find any tracks of the figure. That night they wake up as a skeleton walks through their camp, dragging the body of a dead kobold. They destroy the skeleton.

Vignette Three: Prospecting for silver ore in the wasteland south of their home town, the party spots a 'white mountain,' and as they approach it they see a figure holding something in its arms. When they get closer they find a walking skeleton carrying a white cloth wrapped around a (non-animated) infant skeleton. They destroy it, then find the 'mountain,' actually a pile of bones - thousands of dead bodies. Scattered around it are a few recently-dug graves with only slightly decomposed corpses.


The Adventure: The party needs to find an ancient book so they can find the true name of a demon lord and banish him and his minions. A sage points them to the ruined city of Chathus, in the wasteland to the south.


The History: The city-state of Chathus was ruled by a long line of earth mages who found a great treasure buried on a hillside: an ancient wooden boat, hundreds of miles from the sea, which contained artifacts crafted by the first creator deity. A carving inside the ship - the words glowing with divine light - read, "Rain shall fall until only My chosen people survive." And tellingly, rain constantly fell in the interior of the ship.

Originally a nomadic culture of horse-riders, the Chathans settled above this treasure, which provided them an unending supply of drinking water, though they kept the source secret. Over the following centuries the royal family used a primitive book they found in the boat to decipher other glowing writing on its walls, including things like "Waxing wroth, I destroyed the earth my hand shaped." They covered up everything except "the earth my hand shaped," and they gained the ability to reshape stone with a touch.

One passage read, "Obey this commandment: cherish thy God." They chipped away the part of the wall after 'commandment,' and found that if they brought someone in front of that wall and gave an order, any order, the person so ordered would have to try to obey it.

They used this power to summon demons and bind them into unending servitude. The words of Creation, it turns out, are unyielding.

The royal family's earth mages built complex subterranean irrigation channels and erected huge edifices of stone to mark their might. Their demon binders raised horrific armies, and they ruled cruelly.


The Cataclysm: Four centuries ago, after a long war the mighty city-state of Chathus fell to the armies of the Ragesian Empire. The emperor allowed the monarchy to remain in power as long as they pledged fealty to him. A few years later, though, the emperor's son visited the Chathan queen, Dhyra, on a diplomatic mission. She used these divine words to seize control of his mind and send him back to assassinate his father. He failed, and emperor had to kill his own son. The emperor retaliated and gathered his army, intending to march on the city and kill the queen's children in front of her.

The army approached and smashed through the walls of Chathus. In desperate fear, Dhyra summoned the elemental prince Ogremoch, demanding the power to spare her children from death. Twisting her words, he transformed her into a medusa, and when she gazed upon her children she turned them to stone. Driven mad, not willing to go on living, she rushed to the catacombs of the ancient ship, petrifying every one of her guards along the way.

There she uncovered the full text of one passage: "Waxing wroth, I destroyed the earth my hand shaped."

With single sweep of her hand, she collapsed the entire city, dropping it into a massive canyon. Thousands of her people died, the Ragesian army was driven back, and all she ever loved was destroyed. She expected to be crushed too, but when she finally came to her senses she found the ark had resisted the quake. She wept, surrounded by the rain that would never end.


Encounters in the City
Here's where I could use help. I know what I want the finale of the party's exploration to be -- entering the queen's subterranean palace, where she is attended by skeletal minions and is surrounded by thousands of petrified children she has collected over the centuries -- but what else should the party face along the way?

I have a lot of backstory, but I don't want to infodump it. I'd like them to see clues of what happened so they try to piece it together. If they're smart, perhaps they'll even realize how horrifying a Legendary Medusa Necromancer with lair actions is going to be, and they can prepare for her.

Any suggestions?
 

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A tribe of Grimlocks in the area that worship the queen.

Elementals somehow related to the intervention of Ogremoch.
 

On the outskirts of the canyon, an undead warlock has ancient artifacts for sale. One of these is a piece of the Wall, which says "None shall die lest by my command." The last four words have been covered over with dirt and mud. Those words are partly responsible for the warlock's undead condition.

There is a barracks part-way inside the city, run by the Queen's guard-captain. The soldiers are all undead parents of the petrified children: the guard captain is a flesh golem stitched together by the Queen herself.
 

Throw in some will-o-wisps and/or banshees. Both should be immune to the medusa's gaze, so could be found in or around the ruins.
 

Regional effects within the city. Sometimes when a person turns to look at you, you see a flash of their face hideously contorted. When you take a long rest, make a save to wake up as the earth around you begins to pull you underground; those who fail are entombed in stone with only their faces outside the ground. Dozens of petrified figures lie around the city, and if you are in front of those statues' "eyes" (within 20 ft.) you hear water dripping around you and you have disadvantage on everything.

I need some locations for the party to investigate to find clues where the underground palace lies.
 
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I'm working on a ruined city of my own, and while the feel is a good bit different, I created some random ruins tables here http://vishteercampaign.pbworks.com/w/page/90805500/Ruins in the Barrens that might help you out some.

As far as specific encounters, I would create some haunts that can help reveal your backstory or fill in details.

Or what if they find a whole group of adults, all petrified, all in fleeing poses. Many are posed as if carrying children, or holding out their arms to grip a child's hand, but their hands are missing, chopped off at the wrist, or there are chisel lines where the child they should be clutching has been literally cut away from them?

And of course, you can describe the ruins in evocative ways; all the buildings in the city would lie smashed over from one direction, or at least wide swaths of them would, as she literally swept her hand across the city.
 

Throw in some will-o-wisps and/or banshees. Both should be immune to the medusa's gaze, so could be found in or around the ruins.

I decided to include a couple ruined buildings inhabited by banshees, and if you reduce them to 0 hp they manifest into the building and attack like a 'stone giant.'
 

One technique I use for info dumping is having ghosts exhibit an environmental effect that recreates past scenes.

Example:

The PCs want to enter a building. A horrible wailing of despair comes up from inside it and the floorboards lift up and start nailing the enterences shut. A poltergeist of sorts is sealing the place up. If the players bash on any of the windows or doors, then they have bought into the ghosts delusion/reenactment. They notice that they have a shadowy overlay of Ragesian armor over the top of them. In a shadowy mirage, the city around them is burning and they more clearly hear the womens screams from inside this place.
They need to enter though, so they need to bash open the door while weathering assaults from a poltergeist throwing things at them and maybe an etherial bow shot or two. Once inside they have to deal with an old matron poltergiest trying to push them out and some poor ravished banshees. The longer the encounter goes, the more real it all looks. Maybe add in a save or two vs domination or actually become the Ragesian soldiers. The other party members will presumably stop them from doing bad stuff.

I suggest doing that sort of thing to let players actually play through some of the meaningful moments of the cities past. I often include the ghost of a sage who actively wants them to know what happened here, he cannot speak, but he leads them to places where these sort of flashbacks happen.
 

I'm using Chasme stats for a pack of demon jaguars that have serpents sprouting from their bodies. They maul for a little damage, and then snake venom does a huge amount of necrotic damage that you can't heal until you get a long rest. Then they run away.

And taking a long rest will get you drawn into the earth if the party isn't paying attention.

The first session of exploration went well. The party is appropriately wary of the whole city, and they think that the water in the pipes beneath the city is somehow alive and wants to eat them.
 

The party finished up this adventure last night. After exploring various ruined temples (and one PC finding religion after he dared a god to resurrect another PC who'd died), they headed into the ruins beneath the palace and found Queen Dhyra's lair - a cave with a Noah's-ark-esque boat stuck into the far wall. Water streamed out of a hole in the side of the hull, and wove between little stone spires. Each spire had a locked door access to a room with arrow slits 20 feet up, where the queen's skeleton archers could shoot from.

And scattered around were clusters of 'difficult terrain,' which were actually hundreds of petrified children whom the queen had collected over the years.

Cue a lot of "I avert my eyes this round" as the party stumbled through the cave, getting peppered with arrows while wondering where the queen was. She fired flaming bolts from the far side of the room, which was in total darkness. Finally one PC cued into her location and sprinted, leapt across a chasm, and didn't quite reach the boat where the queen was. So she obliged him by having her skeleton archers focus fire on him, and then she approached. Since he wouldn't be nice enough to stop hiding behind his shield and look at her, she just shocking grasped him into unconsciousness.

The rest of the party closed in, and she misty stepped into the boat through the hole that water was pouring out of. A PC with a stone of controlling earth elementals sent an elemental in. There was a flash of light (as some of the words of God dominated the elemental). The rest of the party followed the queen in, either through the hole or via the roof entrance, and with their eyes averted they hacked and slashed and in some cases bit her. But then she called upon the word of God to compel them to look at her. The horror of her appearance paralyzed them and they could not look away as her petrifying curse took hold of them.

But before they could be turned to stone, one PC who had been lagging behind the whole fight sprinted in, eyes closed, and SPARTAAAAAAA!'ed the queen out the hole in the side of the ship. She reached out, trying to grab onto something, and for a moment the entire ship lurched as the cave itself heaved in his grasp, but she lost her balance, tumbled down the waterfall, and plummeted twenty feet. With a crack of shattering stone she struck the ground, impaled on a petrified child.



All in all, the city and the cursed queen story worked pretty well, I think.
 
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