Cosmic Star is an Adventure Mission about Lesley Dean in Honkai: Star Rail. Check out how to unlock this mission, its walkthrough, and its rewards here!

Cosmic Star Information

How to Unlock Cosmic Star

Unlock Requirements

Complete Whodunit Mission

Cosmic Star can be unlocked once you reach Trailblaze Level 34 or above and have completed Whodunit mission.

Whodunit Mission Guide

Cosmic Star Walkthrough

Mission Walkthrough

	Quest Walkthrough
1	Talk to Lesley Dean in Penacony's Golden Hour, near the Aideen Park space anchor.
2	Speak with Clockie who has something to share about Lesley Dean.
3	Use a Sad Gear to unlock Lesley's Emo Dial. You can find Gears by absorbing emotions from people all around Penacony.
4	Head to the Hotel Lobby and tell Alley about Lesley Dean's situation.
5	Return to the Golden Hour and speak with Lesley Dean.
6	Defend Lesley Dean from the Bloodhound Guards! ※You will fight against 2x Dreamjolt Troupe's Mr. Domescreen, Bubble Hound, and Birdskull. They are all weak against Lightning element.
7	Head to Lesley Dean's room in The Reverie (Reality) to learn about the truth.
8	Search for clues left by Lesley Dean inside the room.
9	After learning about the truth, return to the Golden Hour and speak with Lesley Dean.
10	Help him break free from his obsessions by Emo Tuning and entering his Emoscape.
11	Speak with Lesley Dean inside the Synesthesia Dreamscape, then enter the first creator's Synesthesia Dreamscape.
12	Inside, you can witness Robert's stories and its conclusion.
13	Help Robert remember who is truly important to him by taking a photo of Robert and Harry together, turning off the TV, then changing the photograph on the table.
14	Leave Robert's dreamscape and head to the second creator next.
15	In Jillian's Synesthesia Dreamscape, dispel all of the false illusions created by Jillian.
16	Once you found the source, prepare for a fight. See the best teams to use below. ※ You will have 2x Memory Zone Meme Heartbreaker and 2x Memory Zone Meme - Allseer.
17	After the fight, leave Jillian's Synesthesia Dreamscape to enter the third and final creator's Dreamscape.
18	The third creator turns out to be Lesley Dean's former assistant, Flora. Follow her around to witness Flora's experiences with Lesley Dean.
19	After finding all the creators and helping them, return back to the Golden Hour to have one final conversation with Lesley Dean.

Lesley Dean's Synesthesia Dreamscape Best Teams

Hypercarry Team
Jingliu	Ruan Mei	Pela	Bailu
F2P Team
Serval	Herta	March 7th	Natasha

Enemies in Lesley Dean's Synesthesia Dreamscape are weak to Ice and Lightning. So, make sure to use characters from these elements. The fight inside Lesley Dean's Synesthesia Dreamscape is easy because there are no elite enemies!

Cosmic Star Rewards

List of Cosmic Star's Rewards

Mission Rewards
Trailblaze EXP x350	Stellar Jade x50	Traveler's Guide x5
Refined Aether x5	Lost Crystal x5	Clock Credits x360
Credit x80000

Obtain a New Sticker for Dreamscape Pass

Upon the quest's completion, you will obtain the sticker Celebrity, which you can place in your Dreamscape Pass!

All Dreamscape Pass Stickers and Rewards

Get an Achievement for Completing the Quest

Once you complete the quest, you will receive the achievement, East of Eden. Which will reward you with 5 Stellar Jades.

All Achievements

Honkai: Star Rail Related Guides

All Missions and Mission Types

All Penacony Mission Guides

All Adventure Missions