Route: From Fiun Outpost, run to 97.1N, 51.8W. Run directly from Uber P if you are skipping the optional reward.
[OPTIONAL] Head south at the start of the dungeon and go left. Navigate through to find an Algid Warrior, an elemental who drops keys to chests in the same room.
Head north from start of dungeon, the dungeon is more or less symmetrical.
There are 2 ice walls that must be destroyed along the way.
After the second ice wall, you will come to a gate, to the E there is a room with perched Cowardly Snowmen. The room will do environmental damage. At the other side there is a lever to open the gate.
Kill Tiny and loot Tiny's Head (only one person need to do it if in a group).
Hand this letter to Mr. P at 72.8S, 93.0E, near Freehold for experience and luminance rewards.
[OPTIONAL] Head back to the Pet Shop near Holtburg and talk to/give Larinne Kerendova the igloo for an additional 5% XP reward if you completed the first optional step (note: you can keep the note and turn in both at once, saving you a trip).
Uber P hops up and down with excitement. It's clear this penguin has something for you.
Uber P gives you Letter from Uber P.
You give Larinne Kerendova Letter from Uber P.
Larinne eyes the pages with a surprised look on her face. Suddenly you notice a small tear roll down her cheek.
Larinne Kerendova tells you, "It has been so long since I have seen penguin writing. What a tragic tale this letter tells. Sometimes the best of intentions can lead to the saddest of conclusions."
Larinne Kerendova tells you, "Uber P is quite the eloquent writer, but I will try to summarize his words for you. Uber P had already lost a little brother named Mr. P to the warmth of the southern islands."
Larinne Kerendova tells you, "Penguins are extremely family-oriented don't you know, so when another younger sibling started showing a distaste for the cold weather Uber P feared he would lose yet another brother to the sandy beaches of the Vesayen islands."
Larinne Kerendova tells you, "He thought if he could just get Mouf to spend some time with fellow cold-lovers that he would take to his natural instincts and want to remain in the frozen north with his family."
Larinne Kerendova tells you, "So Uber P sent his little brother off to the Frigid Grotto, but sadly his plan backfired. Upon repeatedly hearing of Mouf's disdain for the cold, the Grotto's inhabitants refused to let little Mouf leave."
Larinne's eyes start to tear up.
Larinne Kerendova tells you, "Uber P realizes he made a mistake in trying to make Mouf's decisions for him. He only cares about little Mouf's happiness now. Damning him to a lifetime in the cold is something Uber P just can't live with."
Larinne Kerendova tells you, "Please go to this Frigid Grotto located at 97.1N, 51.8W and help free Mouf from his frozen prison."
Larinne Kerendova tells you, "Be warned though, the inhabitants of the Frigid Grotto are no pushovers. Expect heavy resistance from the creatures within."
Larinne sighs.
Larinne Kerendova tells you, "I bet a cute little penguin would just love to call a place like this home."
You give Security Station Tiny's Head.
You hold the head of Tiny up to the Security Station window. Seeing a face he recognizes, the guard opens the door.
The Penguin Guard sees the severed head of Tiny in your hand. His eyes widen with fear and he quickly flees through portalspace!
Mouf cowers as you approach. He draws a large "P" in the snow and slips a piece of paper into your pack.
Mouf gives you Letter from Mouf.
Mouf appears to be busy gathering his belongings. He looks like he is preparing to leave.
You allow Larinne Kerendova to examine your Letter from Mouf.
Larinne glances at the letter and hands it back to you.
Larinne Kerendova tells you, "You should bring this to Uber P right away. He will want to see this as soon as possible!"
You give Uber P Letter from Mouf.
Uber P looks at the letter and hops up and down with excitement. He stops after a moment and looks at the ground sadly.
He draws a detailed map in the snow that you recognize as MacNiall's Freehold and slips a letter into your pack.
Uber P gives you Letter from Mouf and Uber P."
Mouf appears to be busy gathering his belongings. He looks like he is preparing to leave.
You allow Larinne Kerendova to examine your Letter from Mouf and Uber P.
Larinne reads the letter and starts to smile.
Larinne Kerendova tells you, "Please bring this to Mr. P in MacNiall's Freehold. It warms my heart to read such a happy ending."
You hand over 1 of your Letter from Mouf and Uber Ps.
Mr. P looks at the letter and hops up and down with excitement. You don't know what the letter said, but you can see the happiness on Mr. P's face."