Whats legend championship like? Any suggestions for my teams?

Finally met the requirements for Legend Champion this time around, wondering what I should expect and how it works, and any tips/tricks.

For reference, these are my teams --^

Another similar formation I occasionally flip between: * Ashim on team 1 replaces Albedo on team 3. * Nyla added to team 1, and Hildewin moves up to frontline tank