The ring Frodo Baggins inherited from his uncle Bilbo is indeed The One Ring. After conferring with the wizard Gandalf, Frodo decides to leave the Shire and take the ring to Rivendell.
Setup: Set Buckleberry Ferry aside, out of play. Add 1 Black Rider to the staging area and make Bag End the active location. Shuffle the encounter deck.
When a player fails a Hide test, each Nazg没l enemy in the staging area engages that player. (Trigger Forced effects after resolving this effect.)
The player cannot advance unless Bag End is in the victory display.
Frodo's friend insist on joining him in his adventure, but danger finds them sooner than anticipated when Black Riders appear in the Shire.
As Frodo watched he saw something dark pass across the lighter space between two trees, and then halt. It looked like the black shade of a horse led by a smaller black shadow. The black shadow stood close to the point where they had left the path, and it swayed from side to side. Frodo thought he heard the sound of snuffling. The shadow bent to the ground, and then began to crawl towards him. -The Fellowship of the Ring
When Revealed: The first player searches the encounter deck and discard pile for a Black Rider, reveals it (cannot be canceled), and adds it to the staging area. Shuffle the encounter deck.
When a player makes a Hide test, add 1 to the total 
for each ally that player controls.
When a player fails a Hide test, each Nazg没l enemy in the staging area engages that player. (Trigger Forced effects after resolving this effect.)
When Revealed: Add Buckleberry Ferry to the staging area.
When Revealed: The first player searches the encounter deck and discard pile for a Black Rider, reveals it (cannot be canceled), and adds it to the staging area. Shuffle the encounter deck.
When a player fails a Hide test, each Nazg没l enemy in the staging area engages that player. (Trigger Forced effects after resolving this effect.)
Response: After a player makes a successful Hide test, place X progress on a non-unique location in play. X is twice the number of players in the game.
You are playing Campaign Mode.
Setup: Attach Mr. Underhill to the Ring-bearer. Add Gandalf's Delay to the staging area. Shuffle Gildor Inglorion and The Ring Draws Them into the encounter deck.
"The Shire, he may be seeking for it now, if has has not already found out where it lies. Indeed, Frodo, I fear that he may even think that the long-unnoticed name of Baggins has become important."
-Gandalf, The Fellowship of the Ring
Resolution: Choose Gandalf's Delay or The Ring Draws Them and add it to the Campaign Pool. Then, choose Gildor Inglorion or Mr. Underhill and add it to the Campaign Pool. The chosen cards have been earned by the players.
Response: After Bag End leaves play, each player draws 1 card for each Hobbit hero he controls.
...it was popularly believed, whatever the old folk might say, that the Hill at Bag End was full of tunnels stuffed with treasure. –The Fellowship of the Ring
While Woody End is the active location, reduce each Hide X value by 1.
At the south end of the greensward there was an opening. There the green floor ran on into the wood, and formed a wide space like a hall, roofed by the boughs of trees.
–The Fellowship of the Ring
When Revealed: Immediately travel to Stock-brook. If another location is currently active, return it to the staging area.
"Why, this is the Stock–brook!" said Pippin. "If we are going to try and get back on to our course, we must cross at once and bear right." –The Fellowship of the Ring
Immune to player card effects.
While there is at least 1 other location in play, players cannot travel here.
Travel: The first player must make a Hide 3 test to travel here.
After Bucklebury Ferry leaves play as an explored location, the players win the game.
While Green Hill Country is the active location, characters get +1 
while committed to Hide tests.
Shadow: Attacking enemy gets +1 
(+2 instead if you have failed a Hide test this round)
While Stock Road is in the staging area, add 2 to the total of the discarded cards when a player resolves a Hide test.
Travel: The first player must make a Hide 1 test to travel here.
Forced: After a player fails a Hide test, shuffle a Nazg没l enemy from the discard pile into the encounter deck, if able.
Shadow: Attacking enemy gets +1 (+2 instead if the defending player failed a Hide test this round).
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Hide 2. Cannot have non-Morgul attachments.
Forced: After engaged player fails a Hide test, Black Rider makes an immediate attack.
The riding figure sat quite still with its head bowed, as if listening. From inside the hood came a noise as of someone sniffing...
–The Fellowship of the Ring
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While Evil Crow is engaged with a player, that player adds 1 to the Hide value for each Hide test he makes.
Shadow: If you have failed a Hide test this round, this attack is considered undefended
When Revealed: Attach to a hero. (Counts as a Condition attachment with the text: "Limit 1 per hero.Forced: After a player fails a Hide test, discard attached hero.")
"He is not far away. I wish to find him. If he passes will you tell me? I will come back with gold."
–Black Rider, The Fellowship of the Ring
Pathless Country gets +4 quest points while in the staging area.
Shadow: After this attack, the attacking enemy engages the next player then makes an immediate attack.
When Revealed: Return each engaged Nazg没l enemy to the staging area. If no enemies were returned to the staging area by this effect, Rode Like a Gale gains surge.
Shadow: Return attacking enemy to the staging area after this attack.
When Revealed: The first player must either exhaust The One Ring or raise his threat 3.
Shadow: Attacking enemy gets +1 (+2 instead if The One Ring is exhausted).
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1 
The first player gains control of Gildor Inglorion.
Forced: At the end of the round, discard Gildor Inglorion. The first player may spend 1
resource to cancel this effect.
"We think you had best come now with us."
–The Fellowship of the Ring
Setup: Add Gandalf's Delay to the staging area.
Each player draws 1 less card in his starting hand.
The next day Frodo became really anxious, and kept a constant look–out for Gandalf. Thursday, his birthday morning, dawned as fair and clear as it had long ago for Bilbo's great party. Still Gandalf did not appear.
–The Fellowship of the Ring
When Revealed: At the end of the phase, each enemy in the staging area engages the first player. If the One Ring is exhausted, this effect cannot be canceled.
"Also," he added, and his voice sank to a whisper, "the Ring draws them" –The Fellowship of the Ring
You are playing Nightmare mode.
Forced: When stage 3A is revealed, if Kham鈥搇 the Easterling is not in play, the first player searches the encounter deck, discard pile, and victory display for Kham鈥搇 the Easterling and adds it to the staging area. Shuffle the encounter deck.
"I do not know for what reason the Enemy is purusing you," answered Gildor; "but I perceive that he is – strange indeed though that seems to me. And I warn you that peril is now both before you and behind you, and upon either side." –The Fellowship of the Ring
Begin with the standard quest deck and encounter deck for the A Shadow of the Past scenario.
Remove the following cards, in the specified quantities, from the standard encounter deck:
3x Evil Crow
1x Woody End
1x Bamfurlong
1x Stock-brook
3x Green Hill Country
3x Pathless Country
2x Rode Like a Gale
Then, shuffle the encounter cards in this Nightmare Deck into the remainder of the standard A Shadow of the Past encounter deck.
Finally, flip this setup card over and place it next to the quest deck. Its effects remain active throughout the game, which is now ready to begin.
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Cannot have non-Morgul attachments.
Kham鈥搇 the Easterling gets -30 engagement cost while The One Ring is exhausted.
Forced: At the beginning of the refresh phase, the engaged player makes a Hide 2 test. If the engaged player fails the hide test, Kham鈥搇 the Easterling makes an immediate attack.
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Eastfarthing gets +2 for each resource token on it.
Forced: After a player fails a Hide test, place 1 resource token here.
After a while they plunged into a deeply cloven track between tall trees that rustled their dry leaves in the night. –The Fellowship of the Ring
While Green-Hill Country is in the staging area, add 1 to each Hide X value.
Travel: The first player makes a Hide 1 test.
Shadow: After this attack, attacking enemy engages the next player then makes an immediate attack.
While Stock Woods is in the staging area, players cannot commit more than 2 characters to a Hide test.
Travel: The first player makes a Hide 1 test.
Shadow: Attacking enemy gets +2 (+3 instead if you have failed a Hide test this round).
When Revealed: Starting with the first player, each player makes a Hide 2 test. Each player who fails this Hide test raises his threat by 5.
Shadow: If the defending player has failed a Hide test this round, this attack is considered undefended.
When Revealed: The first player must either exhaust the One Ring and reveal an encounter card, or make a Hide 3 test.
Shadow: Attacking enemy gets +2 If this attack destroys a character, raise your threat by 3.