I belive its 466 but please take that with a grain of salt I've only done a bit of research on it
Limurs appearance is in chapter 481
but I recommend reading the start of this arc chapter 466 Continental Joint training as the manhwa erased details why we have a joint training and also some more interaction between characters
And also the manhwa changed it too much so it's going to be a lot more confusing to read the novel if your a manhwa reader
Dw the tentacles do exist in the novel
What do you mean by changed?
The manhwa changed too much and also erased some important details
Like
Hyunsungs ptsd in the war, Trash masked contribution to the war in the 1st timeline, Lee kiyeon and the Friendship Guild, the reason why we have Continental joint training and more
Also it's going to be confusing for the manhwa readers to read the novel since Limur/Rimurua only appeared at the city in federation that Hayan destroyed cuz she attempted to summon Belial but accidentally summoned Limur
damn
Can I ask what chapter on the novel we're on?