Shiro no Necromancer ~Shiryou Ou e no Michi~ - Vol. 6 Ch. 27 - Atlantis

[MangaDex]

 

[Nemo2342]

I can't believe our OP MC would stoop so low as to cheat a contest he set up!

 

[Goldenzeal]

I can't believe our OP MC would stoop so low as to cheat a contest he set up!

for shame xD

 

[krater]

I can't believe our OP MC would stoop so low as to cheat a contest he set up!

There's no law in a battle

 

[Baraqiel]

Current mangaka can't avoid inserting future technologies in fantasy genres.

 

[kirby_422]

Surprised we didn't get an internal monologue on what that crystal directly does from the MC. Its safe to assume it did indeed trigger an event since we saw the jellyfish right after.

 

[Milanin]

She probably yelled Sea Dragon because it's a isekai disconnect thing. In Japan they usually yell "Umi da-~~" (It's the sea!), so unless it's a mistaken translation, it's their version of it