Saijaku Muhai no Bahamut - Vol. 8 Ch. 33 - The awakening of the Abyss

[MangaDex]

 

[CrimsonSix]

Since the manga doesn't go past the fifth LN volume, that silhouette on Page 29 would be the only glimpse of

Spoiler

Magialca

for manga-only readers.

 

[imtrash69]

You can actually see this 'person' in chapter 42 as well as other

Spoiler

Seven Dragon Paladins