Guards will try stop Zyllis from leaving Naporia, not attacking but if suspect going to make an exit they'll attack. If he doesn't stop a mage in hiding will cast mental prison

12x Guards (3 at a time), mix of Garrison and Scouts

4x Mastiff (1 at a time)

1x Sapper

1x War Mage

Slaughter
If Zyllis kills large amounts of troops the Empire will use it as propaganda against the Rebellion and Greyhawk, if people see Zyllis they'll refuse to deal with the group and to an extent the Rebellion if they know Zy is still with them.

Duke Thomas will recall support to the group for reckless and unessary slaughter. Town guards will begin refusing entry to Greyhawk owned settlements by orders of the Duke and out of fear.

The Rebellion will be seen as a terror organisation, thinking it's above law and rules of engagement. Using a machine of war to strike fear and slaughter any that stand in their way.

Punishment of death on sight

Capture
If Zyllis gives up or is captured he'll be placed in Dimensional Shackles and placed in the prison again with multiple alert guards and a mage until the army arrives.
If it was just the warden that was killed: 10 years of hard labour and 1,000gp to next of kin.
If more than just the warden: Death

“For the murder of Brath Korsk without justification you are sentenced to death or hard labor up to 10 years, and damages up to 1,000 gold paid to the victim’s kin”

Escape
Zyllis description will be sent to all nearby towns and told to arrest him on sight and that he is extremely dangerous.

The rest of the party at this point is about an hour out of town, prisoners restrained, and cart stationed off the side of the road to avoid any commotion from the town, there is no Zyllis with you and no sign of him.

Day 1: Clear, no stops
Day 2: Travelling merchant, set up by the side of the road with a broken wagon wheel, offering and selling what he can in hopes that someone can repair or make enough gold so when someone who does come he can pay them.
Day 3: Clear, no stops
Day 4: Early in the morning the group see a large odd looking mountain with a structure atop it. Still a full day journey way so it's hard to make out detail but it's clear that the middle is missing but as the day goes on and you draw closer the mountain looks like it's made of thick matted vines and roots are reaching toward and growing from a floating island.

As you approaching the gnomish man wearing long sleeve clothing, his hair graying and features are worn. He greets “Good day, good travellers. You don't perhaps have a spare wheel or gold to spare? I have goods in exchange if you wish.” Only needs 3 gold for repairs
His name is Dref, on his way to deliever a cart load of wool to Queenstown

If the group doesn't buy anything and just assists Dref will give them a letter to show the inn keep, Kresk, she's a lovely woman, this will make sure you have somewhere to stay and keep full, and an extra reward for you.

The Perfect Blanket: A simple black bear fur blanket one side depicting a campsite with red and silver threads and the other an igloo with blue and silver thread. It is a thermal blanket with perfect heat transfer: one side is always warm, the other is always cool. Can be used to survive extreme temperatures

https://www.reddit.com/r/dndnext/comments/hp8e75/here_are_a_bunch_of_more_flavorful_and_slightly/

Merric, you've travelled through here many times in the past with your clan helping locals as the town is home to many Dragonborn, although you've never lived here many count you as a local but this is the first time in around 2-3 years since you've been here The town of Ruststille has more or less returned to normal, everyone unharmed in town seems to have a 6 month gap in their memory and those missing body parts are tramatised by the cults doing but are aiding in restoration and trying to return to normal. Followers of the Wild Mother are trying to bring Pinga's monastery back to ground level. All are welcoming, guards no weapons and are freely talking to citizen and helping them. from a quick look can easily spot 10 or so dragonborn walking around.

If they ask for a commander or mayor, etc. they are pointed to a Lizardfolk man playing with some children in the street, Vizzo. Upon hearing that there is trouble in Naporia and the army is starting to move toward Naporia and likely onto Ruststille, hearing this Vizzo reassures that the town will be safe, they have defences but will not let on what they are to make sure they're not comprimised.

As your travelling through town, you hear a calling out in your direction, as a large silver dragonborn approaches, arms wide “Son! How have you been?”, Merric you immediately recognise Heskan. Has to kneel down to hug.
What: Recently heard that the town was taken over by slavers and left in ruin, when we arrived the slavers were gone and people were struggling.
Who (Clan): The whole clan is here trying to help, most are closer to the monastery helping the ones used as slaves. Your mother and sister are helping some preists from OldTree with the rejoining.
Who (Cult): The slavers might of been the same cult but looks like they failed again, similar situation to when we found you. It's difficult to get up and down but it's only lizardfolk up there now cleaning, everything else was brought down and burried by the preists.
When: It's been a month since the island rose but unclear how long before that the town was under control.
Naporia: Sounds like your the first to arrive with news, no messengers or sages have come with news.