How strong are the guardians?

What exactly is the strength of the guardians? We already know that each floor has a guardian who controls all the Shinsoo on the floor and that they are extremely strong. To kill a guardian, the only one that has been killed so far (that I remember), it took the 2nd strongest being to ever step foot in the tower (maybe), Enryuu. In short, what I want to ask is do all guardians have similar strength or will it increase according to their floor. Does the guardian of the 2nd floor have the same strength as the whale that appeared in chapter 233?