/Accel Zero Order was a blast story-wise, but sadly that was the time when my phone died alongside my first account (forgot to rebind) so I didn't get to play much of it. I remember the node unlock being pretty weird though. Now I want /GO to have a serious event again one day, just for the occasional change of mood from the wacky events.

KnK was a blast due to the introduced mission system but zombie farming was a big pain for me because the best node for it only has like 10 zombies at max and my team back then wasn't suited to face the Demon and Nero Bride back-to-back. But free Shiki was amazing.

For more recent events, despite of failing to get Cleo, I really like Halloween 2016 (finally getting a gold saber aside). The aesthetics, the encounter-increasing CE, the BGM, and the story was pretty fun, although the challenge quests were a bit of a letdown.

[@GreenGoat] Huh, then perhaps I would've an easier time with her if I have a gold archer that can survive 2 or so Clarent Blood Arthur. yeah...in hindsight, I could've just waited for after Summer Event to use someone's Archuria to deal with Mordred.