The Keeper of Unspoken Secrets

About
The Keeper of Unspoken Secrets is probably one of the easier bosses in the game after you get past the minion phases. He has 500 health.

Cutscnes
The player is teleported to The Unspoken Arena, where they must press a pressure plate to open an iron door.

<???> It's time you knew my name! It is I, the Keeper of Unspoken Secrets!

Then, the player must step on another pressure plate on the other side of the door.

 Oh, how I can see you and you can't see me... How wonderful is that? Also, did I mention I like Blazes?

Several Ancient Blazes spawn. After awhile, the KoUS will say the following:

 None of you stand a chance against my army of blazes!

 You are all foolish for trying this...

 You mortals are proving to be rather annoying.

After the KoUS says his last phrase, the blazes that havent been killed despawn. Then, he says the following.

 So, you dare try to assault me? My guardians will make sure you don't make it past them.

Two Guardians of Unspoken Secrets are spawned. Each has 250 health, low defense, and low base attack. Their attack is greatly improved by their Doomsword. After a few seconds, the Keeper will say the following:

 Hmmmm... You tempt the anger of a Keeper.

All players will be struck by lightning, instantly killing everybody with low health. The guardian fight will continue for two minutes, which is more than enough time to kill both of them. Afterwards, the Keeper will say the following:

 You dare destroy my guardians?!

If the guardians are not dead by this point, they will despawn. The Keeper will then say this:

 Luckily, I still have my ghasts!

Two ghasts are spawned. After 30 seconds, the ghasts will be assumed dead and the Keeper will say the following:

 So, you've killed my ghasts.

 Your reward is.....

 A SWIFT DEATH!

Then, the Keeper will spawn, charging at a random player. He will then say this:

 What? Are your surprised I'm Witheran?

 I hope I'm commended for this... Your lot is much too easy to kill.

After litterally seconds of being spawned, the Keeper will say the following:

 Let's make this interesting!

Two clones will be spawned. Though having the same attack as The Keeper, they don't drop anything, their armor isnt enchanted, and they only have 100 health.

TBC