Enuo... Enuo... why does that name sound familiar?
Enuo: Humans, is it? To have come all the way here, the ending point of both light and darkness... What do you seek from this place? Power? Fame?
An end to this LP, since the postgame content is dull as dishwater.
Enuo: Foolish humans. Those do not await you here. Here, there is nothing. No past, no future, no present. All that is sealed within this beautiful darkness is the stillness of eternity. I see you've begun to understand my glorious existence here.
Yeah, now I remember. You're the guy who got killed off 1000 years ago. Did anybody really need extra closure on your plot hook? You traded immortality for the power of the Void, got yourself killed by twelve heroes with twelve weapons, the monsters you set loose during your reign of terror got sealed up in a big tree in Moore, etc. etc.
Enuo: Yet, perhaps it is best if you see for yourself my power... Power that held the whole world in fear... ...the power of the Void!
How come you get a big dramatic fight entrance, but stronger monsters like Omega Mk.II and Neo Shinryu just pop up like everything else?
Like almost every other boss in the Sealed Temple, Enuo has a defense against !Rapid Fire. But it's the same as Neo Shinryu's: there are two invincible targets in this battle, Enuo's hands. Each of them casts spell independently, so it seems like he's pummeling the party with a crazy huge number of spells when in fact they're besieged by three spellcasters at once.
Enuo can be Slowed, but his magic defense is too high for a Slow spell to work. You need some other way to inflict it on him, like by firing it out of a cannon. (As I recall, mixing ammunition with Turtle Shells gives Slowing shots, but it's not a detail worth looking up right now.)
Enuo is pretty good at Blue Magic, if you've somehow made it this far without Aeroga or Aqua Breath.
He has some spells we've never seen before, though.
We're pretty good at magic, too.
This message indicates the second half of the battle has begun. Enuo refills his 60,000 HP and gets automatic Protect and Shell, sheds his vulnerability to Slow and Stop, but also loses the extra targets in his hands.
But with those two targets gone, there's nothing stopping good ol' Flareblade !Rapid Fire. Bartz is equipped with both the Ultima Weapon and the Brave Blade, with Faris using the same attack with Apocalypse and... eh, whatever it was Faris had in her other hand.
60,000 HP does not last long under that kind of barrage.
Enuo was slain by the twelve legendary weapons, consumed by the Void, slept in stasis for 1000 years, and woke up just in time to be slain by even better weapons than the ones before. Raw deal, but what do you expect when you try to rule or destroy the world with the ultimate magical power?