Sword Art Online: Lost Song (PlayStation 4)

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Black Lotus

Finish the Story Mode and speak to Strea as Kirito. Strea will start to glitch and you'll fight her as a level 1000 enemy.

Custom Character Creation

To unlock Custom Character Creation just complete the first Island. After beating Fafnir you will be able to create a customized character in the Cafe/Multiplayer room. Talk to the girl behind the counter to the Left of the door.

Lux

Complete the game and speak to an Undine in the plaza. Go to the dungeon in the top right of the map on Nibelheim.

Rain

Complete the game and you will find her in the first island fight her and you must win.

Seven

Post game you can play a short storyline quest with her by visiting Agil's shop after completing subevents with Rain.

Sumeragi

Finish story mode. You can find him in Woglinde on a floating island standing next to a chest after Dueling Rain as Kirito. Talk to him.

Various Trophies

Complete the following tasks to unlock PlayStation 4 trophy rewards.

TrophyHow to unlock
A Deeper Bond: Asuna (Silver)Complete Asuna's side story. "Stay with me forever, Asuna."
A Deeper Bond: Leafa (Silver)Complete Leafa's side story. "I hope that I'll always get along with Sugu."
A Deeper Bond: Lisbeth (Silver)Complete Lisbeth's side story. "We're going to forge a lot of memories together, whether you like it or not."
A Deeper Bond: Silica (Silver)Complete Silica's side story. "I won't tell anyone what happened here today."
A Deeper Bond: Sinon (Silver)Complete Sinon's side story. "Sinon is an indispensable part of this team, and an important friend."
A Game Where You Can Die Is Too Easy! (Bronze)Have the character you are controlling reach 0 HP and become a Remain Light.
A Paradox of Light and Darkness (Bronze)Reach the story chapter "A Paradox of Light and Darkness."
A Worthy Rival (Bronze)Befriend Sumeragi.
ALO's Strongest Player (Platinum)Earn all trophies. "You are an excellent fighter. The best I have ever seen."
Accessory Collector (Silver)Collect 50 different accessories.
All These 100,000 Yuld Mithril Pieces...! (Bronze)Have more than 1,000,000 Yuld.
Annihilator of Enemies (Silver)Defeat 1,000 enemies over the course of the game.
Battle of the Knights of the Tri-blade (Bronze)Reach the story chapter "Battle of the Knights of the Tri-blade."
Being a Solo Player Isn't So Bad (Bronze)Complete a total of 10 side quests, Extra Quests, and/or Multiplayer Quests with a party consisting of any single character.
Bounty Hunter (Silver)Complete a total of 100 Extra Quests and/or Multiplayer Quests.
Can I Get a Raise? (Bronze)Resurrect a party member who has become a Remain Light.
Contractor (Silver)Complete a total of 100 side quests.
Fairies in the Sky (Bronze)Reach the story chapter "Fairies in the Sky."
Girls Ops (Bronze)Complete a side quest, Extra Quest, or Multiplayer Quest with a party consisting of Silica, Lisbeth, and Leafa.
Guys Night Out (Bronze)Complete a side quest, Extra Quest, or Multiplayer quest with a party consisting of Kirito, Klein, and Agil.
Intertwined Desires (Bronze)Reach the story chapter "Intertwined Desires."
It's Just Like Old Times (Bronze)Complete a side quest, Extra Quest, or Multiplayer Quest with a party consisting of Kirito and Asuna.
Ki-bo's a Playah! (Bronze)Go to the festival with all the game's heroines. "This's a sweet scoop!"
Let's Start With a Test Run (Bronze)Complete your first side quest.
Lies (Bronze)Reach the story chapter "Lies."
Lisbeth's Smithy Appreciates Your Patronage! (Silver)Raise a weapon's Enhancement Level to its maximum.
Skill Maniac (Silver)Learn every possible Sword Skill, Magic Skill, and Special Skill for a single character.
Skill Master (Silver)Raise Asuna, Yuuki, Rain, and Sumeragi's OSS to level 100.
Slayer of Enemies (Silver)Defeat 5 or more enemies at the same time with a single attack.
Spellmaster (Silver)Raise a single Magic Skill or Special Skill to level 500.
Super Player (Gold)Complete an Extra Quest without taking damage.
Sword of Kings (Silver)Obtain Excalibur.
Swordmaster (Silver)Raise a single Sword Skill to level 500. *OSS included.
The Dark World (Bronze)Reach the story chapter "The Dark World."
The Red-head in the Shadows (Bronze)Reach the story chapter "The Red-head in the Shadows."
The Twilight of the Gods (Bronze)Reach the story chapter "The Twilight of the Gods."
The Two Idols (Bronze)Reach the story chapter "The Two Idols."
The World of the Black Fairies (Bronze)Reach the story chapter "The World of the Black Fairies."
The Youthful Goddess (Bronze)Reach the story chapter "The Youthful Goddess."
We're Not Done Yet! (Silver)Complete all main story chapters. "We still have a lot more gaming left to do!"
Weapon Collector (Silver)Collect 100 different weapons, not including shields.
Welcome to ALfheim Online! (Bronze)Log into ALfheim Online.
Your Adventure. (Bronze)Create a party that includes your own custom character.

Walk through walls

While controlling a character a mace, dagger or dual wielding swords, go up to a wall or obstacle and repeatedly use the first square button attack. You will slowly inch forward and eventually get inside the wall or obstacle. You can walk around inside the wall and bypass some locked doors or scenes. While inside the wall you cannot attack enemies with attacks or magic and they cannot attack you, but you can still buff or heal allies.