Yeah I got into the official FFRK leaderboard on day 7. Not to bad when you restrict yourself to F2P.
When you look at the game design of this Nemesis End Boss fight, he does have some redicculous stats and skill set. High action speed, means he is doing way more actions than you can doe and with lots of aoe attacks your party will suffer. So the first few days of trying lots of dying. It wasn’t until day 4 that I manage to make some real progress and I could manage to survive the first couple of attacks.
On day 6 I got to the near end (a big part thanks to Relms BSB). With a couple of near victories enough struggle for that day. Decided to rest and try again the next day and then the killshot with Vanille doing her command2 attack.