In the Shadow of the Undercroft - Hogwarts Legacy Quest

The Path to Hogwarts

Welcome to Hogwarts

Defence Against the Dark Arts Class

Secrets of the Restricted Section

Tomes and Tribulations

Herbology Class

Potions Class

The Girl from Uagadou

Trials of Merlin

Scrope’s Last Hope

The Hunt for the Missing Pages

Prisoner of Love

Ollivander’s Heirloom

Jackdaw’s Rest

Flying Class

In the Shadow of the Undercroft

The Room of Requirement

The Map Chamber

Percival Rackham’s Trial

Beasts Class

The Caretaker’s Lunar Lament

The Helm of Urtkot

In the Shadow of the Estate

The Elf, the Nab-Sack, and the Loom

The High Keep

Astronomy Class

Back on the Path

Charles Rookwood’s Trial

Fire and Vice

It’s All Gobbledegook

In the Shadow of the Mine

The Headmistress Speaks

The Polyjuice Plot

Niamh Fitzgerald’s Trial

In the Shadow of the Mountain

Weasley’s Watchful Eye

The House Cup

Like a Moth to a Frame

Crossed Wands: Round I

Crossed Wands: Round II

Flying Off the Shelves

Gobs of Gobstones

Cache in the Castle

Spell Combination Practice 1

Spell Combination Practice 2

Crossed Wands: Round III

Venomous Valour

‘Dissending’ for Sweets

Interior Decorating

The Daedalian Keys

Summoner’s Court: Match 1

‘Mer-ky’ Depths

Summoner’s Court: Match 2

The Hall of Herodiana

The Tale of Rowland Oakes

The Man Behind the Moons

The Plight of the House-Elf

Summoner’s Court: Match 3

‘Beeting’ a Curse

Foal of the Dead

All’s Well That Ends Bell

Summoner’s Court: Match 4

History of Magic Class

Phoenix Rising

Portrait in a Pickle

Summoner’s Court: Match 5

In this walkthrough of the Main Story quest “In the Shadow of the Undercroft”, we’ll guide you as Sebastian shares a sweet new spell, and you share some secrets in return.

Quest Type: Main Story
Location: Astronomy Tower, Hogwarts Castle (map)
Requirements
- Level 8
- Complete Flying Class
Rewards
- 260 XP
- Confringo

Meet with Sebastian

Sebastian is waiting for you near the Astronomy wing — your closest Floo Flame will likely be the Defense Against the Dark Arts Classroom, so use the closest fast travel point, then continue to your meeting spot (press if you need guidance from your compass). If you don’t see Sebastian, try looking away from the meeting spot, as he will sometimes not load in while you’re looking at where he’s supposed to spawn. Once you find him, speak with him by pressing /

Enter the secret room

When your conversation ends, follow Sebastian, and he’ll lead you to a strange looking clock. Walk up to it and hold / to enter the Undercroft.

entering the undercroft in the shadow of the hogwarts legacy walkthrough

Explore the room & Talk to Sebastian

After a brief cutscene, you’ll find yourself in a large chamber. Sebastian will chat a bit — once he falls quiet, your objective will change to “Talk to Sebastian”, at which point that’s what you’ll need to do: walk up to him and press /. After another conversation, he’ll teach you Confringo. The sharp turns of the Z shape can make this minigame tricky, but you’re an accomplished spell caster by now! Don’t forget to look ahead at the required buttons before starting the casting attempt.

Practice using Confringo

Open your Spell Menu with and put Confringo into your Spell Diamond. Then you’ll need to cast it on the three candelabras in the room — one in the northwestern corner, one to the east, and one to the south. The spell has good range, but if you’re having trouble hitting one of the candelabras, hold to aim carefully before casting Confringo.

candelabras to hit with confringo in the shadow of the underdark sebastian quest hogwarts legacy walkthrough — One of the three candelabras you need to destroy with Confringo

Check back with Sebastian

After you’ve destroyed all three candelabras, go back to Sebastian and press / to speak with him once more. He’ll get you talking about your Ancient Magic abilities, and then it’ll be time to go.

Leave the Undercroft

Head to the door you came in, in the northeastern corner of the chamber, and hold / to leave the Undercroft. Upon exiting, you’ll be accosted by Ominis Gaunt. When your conversation with him ends, you’ll have completed the quest! Next up, The Map Chamber.