This renown mechanic can be used in one of 3 ways:

1. Power Gamer Method - Players are made aware of the renown and are given the liberty to spend it on whichever shopkeeper they wish. They may also be made aware of what effects will be granted for each renown unlock. The narrator can then Narrate a brief explanation on how they ingratiate themselves with the shopkeeper.
2. Balanced Method - Players are made aware of renown, but not the potential rewards. Player’s characters must have positive interactions with a shopkeeper or owner in order to access their property or merchandise. The Narrator then spends the renown on the shopkeeper or property owner the players had the most positive interactions with between encounters. 
3. Role-player Method - Players are not made aware of the renown mechanic or the potential rewards. Instead, the narrator records and spends their renown on whatever renown reward they deem fitting for which characters the player’s characters have interacted with or aided.

After the initial attack the city goes into lockdown. While there are many shops in the city, most of the stores and businesses that would normally be opened are currently closed due to the crises brought on by the Melding.

However, they might make an exception and open their businesses to people working hard to protect the city. 

The player's renown can be used to “unlock” the various businesses in town. The table below can be used as a reference for the renown cost, the owners and their personalities and the benefits of doing business with that establishment.

As the Narrator you may choose to award players additional Renown towards certain establishments listed as reward for good roleplay or actions taken. You may also choose to have player’s characters lose renown if they act particularly poorly or brutish towards individuals in the city. 

The General Store sells Feudal Age Food and Drink, Toolkits, Equipment, Supplies and common clothing and light armors.

The Tavern sells Feudal Age Food and Drink, Rooms, Mounts.

The Fletcher sells Feudal Age Common and Uncommon Ranged Weapons(except black powder weapons).

The Blacksmith sells Feudal Age Common and Uncommon Melee Weapons, as well as Medium and Heavy Armor and shields of all types. 

The Potion Shop sells a selection of Feudal Age Potions(except poisons).

The Enchanter grants access to the Enchanted Items list.

The Dark Market sells Feudal Age Assassins Tools, Poisons, Black Powder Weapons.

The Siege Workshop allows access to Feudal Age Siege weapons such as a Ballista, Catapult or Trebuchet to aid you in battle from a distance.

The Royal Armory grants access to a list of Feudal Age Rare Melee and Ranged Weapons and Armor.

There are a number of abandoned or seized storage crates within the warehouse. The owner has offered to allow the saviors of the town to open 1 crate per day, so long as they take whatever they find inside with them.

Effect: Roll 1d10 to determine the items found within the storage crate.

With these training grounds you can practice your moves and abilities.

Effect: Gain .75 XP After each Encounter.

The bath house offers spa services along with their heated and scented communal tubs. The owner has kindly offered their remaining services, free of charge, to the saviors of the town until the crisis is over.

Effect: Regenerate HP and Attribute Resource Points at Double the Rate for each hour spent Resting at the Bath House.

There are a number of safety deposit boxes that have been seized over the years but have yet to be opened. The value of these individual boxes is not estimated to be high and therefore Mr. Shilling has graciously offered to allow the saviors of the town to open 1 deposit box per day and keep whatever they find within.

Effect: Once per day you may open a seized deposit box. Roll 1d10 to determine the amount of money/valuables found within.

Should the PC choose to ignore the call to action, inform them that they don’t HAVE to do this. They could flee from this place and attempt to make it on their own. However, they would most likely be caught facing one of these creatures on their own and surely perish; As not all the creatures pouring out of these portals head to the city. 

Also, what kind of story would that be if all the heroes left when things got tough?

If any players still choose to run you can either narrate how they perished while running for their lives or run a small encounter that was not used for the module and have the monsters swiftly dispatch them while they are alone and without backup.