Quote from AnnaJellicle13 >>

RATS, WE'RE RATS; WE'RE THE RATS. WE PREY AT NIGHT WE STALK AT NIGHT WE'RE THE RATS

 THAT'S THE GIANT RAT THAT MAKES ALL OF DA ROOLS

Are you able to tame these rats? And if so how?

They're a staple meat in goblin, kobold, xvart, mite, and orc diets when they can't hunt larger game or other humanoids.

these ones make all of the rules

Monster Manual, pg. 327

The rat jumps at you. It likes shiny things. Run!

From the reprint of The Sunless Citadel in Tales from the Yawning Portal:

Ventilation. All keyed areas contain an adequate air supply. The air is renewed from countless cracks leading to the upper open cavern and the surface. These cracks are too small for any but creatures such as giant rats to navigate.

Now as a GM I would rule that Small PCs like halflings and gnomes anatomically can't squeeze through the same narrow cracks that a Small sized rat or cockroach could (though a druid could easily wildshape into a suitable creature).

In the original adventure as published for 3.0e, the rats (which that edition calls "dire rats") are still Small, but the cracks in the citadel walls are described as "individually too small for any but Fine creatures to navigate", i.e. ants, cockroaches, maybe a very small mouse.

Obviously they needed to edit the text as "Fine" isn't a size category in 5e, but I wonder whether such a large change was intended.

it says giant rat but it's a small creature how is this meant to work

OH THANK YOUU

Absolutely on the mastiff. Maybe 7-10 hp, less than a wolf but much more than any commoner. 

regular rat

Quote from RosslynPaladin >>

OKay but how big is it actually? You can't just say Size Category and expect that to work. 

 Well taking the old 3,5 sizes (wich I think work quite well still) they would be 2-4 feet and weight 8-60 pounds 

roll a dc 14 perception check to belive the size of the rats

13

What tf is this brilliant shit

Check out Mzmr on Apple Music 

im ganna make a rat king ooooo im gonna scare my players ooooooo >>>:3

I’M THE GIANT RAT THAT MAKES ALL OF THE RULES

It looks like my cat when it gets scared :D

Why is it called Giant Rat when its size is Small? Shouldn’t it be just Rat or something?