This video guide at Seeking Tech will show you how to find all nine of the Lost Gestrals in Clair Obscur: Expedition 33.
If you talk to Sastro after finding a Lost Gestral, then he will reward you. You can find the list of rewards below:
1 Gestral: Maelle’s Gestral Haircut
2 Gestrals: Lune;s Gestral Haircut
3 Gestrals: Sciel’s Gestral Haircut
4 Gestrals: Paint Break Ability
5 Gestrals: Verso’s Gestral Haircut
6 Gestrals 3 Colours of Lumina
7 Gestrals: 3 Colours of Lumina
8 Gestrals: 5 Colours of Lumina
9 Gestrals: Pro Retreat Picto
You will also unlock the Lost Gestrals trophy and achievement.
You can find the video showcasing the locations for each Lost Gestral, along with the time stamps, below:
0:00 Lost Gestral #1 (Near Esquie’s Nest)
0:38 Lost Gestral #2 (Southeast of Stone Wave Cliffs)
1:30 Lost Gestral #3 (Southwest of White Tree)
2:22 Lost Gestral #4 (Southwest of Monoco’s Station)
3:21 Rewards for finding 4 Lost Gestrals
5:25 Lost Gestral #5 (Northwest of Old Lumiere)
6:07 Lost Gestral #6 (North of Coastal Cave)
6:37 Lost Gestral #7 (Southwest of Isle of Eyes) – Requires Esquie’s Flying Ability
7:24 Lost Gestral #8 (Near Endless Night Sanctuary) – Requires Esquie’s Flying Ability
8:07 Lost Gestral #9 (Southwest of Endless Tower) – Requires Esquie’s Flying Ability
9:07 Rewards for finding 9 Lost Gestrals