We were all warned by DW that it was coming and given multiple chances to prepare for it. I’m sure some of us were even convinced we were totally ready.
I myself thought I was ready, but I’ve found that I’m struggling on the Rider floors, and to a smaller extent Casters. (I’m also having Berserker headaches, but mostly for “Who can I use to kill these without hurting myself later on?”)
I’d completely forgotten that my only leveled Assassins were First Hassan at ~lvl 60 and Mochizuki at 40 (literally only leveled her to First Ascension so I’d stop seeing her hideous 1st form.) I used the EXP cards that the event’s been handing out to get Danzo to 58, but her NP isn’t exactly dealing much damage.
In regards to Caster floors, my only leveled Riders are Maid Alter at 70 and Martha at 53. This is less of a problem, because Maid is going to kill them without too much trouble, but it takes longer.