What's the hardest lunatic chain challenge atm in your guys' opinion?

It was ok but kinda close for the last map for me. My A team for CC:tharja, nino, brash assault desp rein, and azura did it for me. Rein can take care of hardin and tharja can finish off grima.

The hardest was CC 11+12

Chapter's 5 & 6 are annoying. I hate the first map Grima's on (with the other two dragons and armored unit) since it has to be done within a certain amount of time, and the only unit that can obliterate Grima is my Alm (Masked Marth could also, possibly, but I haven't tried), but then Hardin comes in and is a complete nuisance. Then there's the map of both Grima AND Hardin..

Ugh.

Chapter 11&12 that's for sure...

Paralogue 17 & 18. Paralogue 15 & 16 was also hard.

As others have said... Book 1, chp 11/12 by far. Turn limits are stupid.

That one wasn't that bad, for me it's Chapter 11/12 (like others said). Stupid turn counts,