Final boss battle technical problem

[K. Governor]

Hey guys, just checking if anyone of you having the same problem. Being playing mine on my pc for 60 hours and finally battling the final boss.

During the battle, you are supposed to fire the siegfried gun which you obtained from Zaveid, just like how you did it with Mayvin. The problem is this. Such option does not trigger and I ended up whacked by the boss.

You cant just try and kill it off with normal attack. Thus that made the whole game to a standstill, unable to beat the final boss and get to the ending.

So if you guys have similar problem, do share. Wanting reply from Bandai Namco regarding the issue at the moment.

[Kite]

Its not an issue, its just your not doing enough damage to it in order to trigger the gun. I ran in to the same problem and had to lower the difficulty in order to beat it. Although farming gear and upgrading it would solve your issue as well if you upped your DPS :D

[Simon]

When the enemy says "let me show you true despair" and starts charging its attack, you have to keep attacking it until you does enough damage. If you've done enough damage, the screen will tell you which button to press and it will trigger the gun. Use weaker seraph to armatize when using the gun because the seraph will not be usable next because he/she has become the bullet of the gun. The required damage will be higher the next time after you shoot the boss. After this battle, you will fight Heldalf solo and you only need to trigger a Mystic Arte and you can instantly beat it.

[[Lethalvriend]]

On normal it seems the phases trigger at 150k, 100k and 50k HP. You need to do an additional 20k damage before the button appears (so 130k, 80k, 30k remaining HP). I actually had to give up on the final boss because of this and do some extra side quests and get gear/exp etc. It's a bit of a letdown that they put a DPS check on that boss as I could easily beat him otherwise.

[RhoydeR]

Try out each Armatisation before the End Boss and use them in a good Order to not Fire your best Seraph first. Use the Blast Attacks without second thoughts, you get them refilled after shooting each time. But I suggest using them only If you're sure to not get interrupted or when Heldalf prepares his OHKO attack. Also having Rose up isnt a bad Idea, as she contributes quite a portion of damage to him. Revive her (she mostly lies around dead...) when the DPS Check starts.
Most people Fire either Zaveid or Mikleo first, as they call them weaker. Edna and Lailah have an pretty powerful Blast Attack, which makes them more valuable towards the End. To me it felt like the last DPS check is taking an additional small amount than any other. So chose carefully.