As you can't see, the Citadel in this room is Absent.
Nevertheless, the immense length of the Chain it was made for can be seen!

[X] Alex's Chain Fortress
https://dopcom.net/creechers/p/room/OqnOACPi

[X] chakhatic's Rare Citadel of the Chain of Creation
https://dopcom.net/creechers/p/room/QWHhACTO

[X] Donut's Loud Temple of the Chain of Cold
https://dopcom.net/creechers/p/room/lS4-ACT8

[X] folk's Chain Citadel
https://dopcom.net/creechers/p/room/F66xACRz

[X] starryrainz's Dark Atrium of the Nameless Chain
https://dopcom.net/creechers/p/room/Yfu_ACUu

[X] thunderzizi's House of the Prismatic Chain of Adequate Life
https://dopcom.net/creechers/p/room/Y9baACUy

[X] shmewtep's House of the Chain
https://dopcom.net/creechers/p/room/ghUVACPi

[X] BlueTinge's Common Locus of the Chain
https://dopcom.net/creechers/p/room/18iiACRz

[X] tinytoes's Studio of the Chain of Victory
https://dopcom.net/creechers/p/room/Da7oACU2

[X] limikun's Cabin of the Hollow Chain of Power
https://dopcom.net/creechers/p/room/NUBhACU3

[X] wit's Prismatic Workshop of the Radiant Chain
https://dopcom.net/creechers/p/room/VoInACR0

[8] Hypercube34's Atrium of the Chain of Light
https://dopcom.net/creechers/p/room/qCk5ACVF