Need help creating a monk BBEG

[Jesuncolo]

Hi there!
I'm GM a game in an homebrew setting. It has all the D&D 3.5 PHB deities, + Lolth, Eilistraee and Sune.
In the great lands of Panzrel and Anglonas, some dark forces are giving black magic to various people.
They are Belial and Xiao, and they're the bosses of the Court of the Miracles.

Belial is the result of the Pride of Gabriel, a wizard who thousands of years ago wanted to become immortal, and gambled with the gods:
"I will create a perfect being, and you will grant me eternal life!"
Gabriel knowing no such being could exist, created a great illusion, called Belial, and was granted immortality. Belial was aware he's an illusion, and hated his creator, Gabriel. He called the gods, betrayed his creator, in hope they would grant him existance. Gabriel was condemned to eternal aging without death, but Belial was denied his gift and ignored. Despair threw him in the arms of the Dark Powers (Ravenloft), who imprisoned him in Mnèmosine, a new realm made of pure illusion and shadow from the Plane of Shadows. He managed to send a simularum proxy through the Mists to act within the Material Plane. He wants to become real, but he will never be. So, he strives to bring the Material Plane into Mnèmosine, by feeding it with evil acts, black magic. This way, the "existance" will be no more.

Now, down to buisness. The campaign also as another BBEG, Xiao. He's a monk, with a mask, three swords on his back and dark clothes.
And I have no idea why he should be selling black magic and promoting evil acts. And what could be his objective. Xiao is actually background-less, though he has a lover, Veladrel, a powerful elf magus.

Plus, I don't know how to build him. I planned to make PC battle Belial just the session before Xiao, the last boss.

The characters 'til now are:
- Amelia/Lareya El'Falashelen, a drow half-celestial rogue1/cleric of Eilistraee X CG, daughter of Cenwyn an high-level drow rogue/shadow dancer CN devoted to Olidammara. Fanatical, naive, altruistic.
- Drew El'Falashelen, a drow half-red dragon rogue 2/ranger X CN, principally bow and two handed sword, poisons, favored enemy (human). Brother to Amelia and son to Cenwyn. Troublemaker, troubleshooter, often questioning and bothering morality. He fears and hates horses.
- Kee Mimic, human monk, LN. Sexually open, prideful, introverted.
- Ardaran Tyr'Valad, infernal sorcerer, LN. He's a member of the Tower of Bonds, a bank/notary/judge organization. Strictly lawful, likes to sign contracts for almost everything, greedy, subtle.
- Xuè Faninto, human bard from another continent, LN. He's lost his memory. He and Rasul (his vystani friend) were commanders at a king's court,

Mature Audience Only:

but Rasul raped the king's daughter

, and deleted Xuè's memory of the last five years and threw him away, because the bard was the only one who knew about this. Rasul wanted to be a normal person in his friend's mind. Drummer, sensual, kind, respectful, curious, skill monkey, enchanter, archer.

I need:
- Stat for a challenging 20° monk, maybe with swords. He'll be paired with a high level elf magus and some other stuff. 25 point buy.
- A background for said monk, coherent with the story.

Thank you in advance!

[deuxhero]

For Monk builds, your options for being effective are for the most part either "Zen Archer" or any 2 of Hungry Ghost, Sensei and Qinggong (all 3 runs into problems with when you can get alternate ki power, but it can work).

As a leader type character and he won't fight more than once a day so free Ki replenishment is of lesser value, I'm inclined to use the Sensei/Qinggong option which will be a great boost to his minions (even before he shares True Strike alongside it.). Give him Temple Swords (as Monk doesn't need anything special to be proficient with them. If they fight when he is level 12 or higher, giving a bunch of minions Sorching Ray

As for motive, I'm assuming you don't want to go with the obvious "thrall" (willing or not)? Perhaps he just wants to spread knowledge, but is completely immoral about the knowledge's use? Qinggong gets infinite Share Memories as an option, which can be very interesting with this goal (or a lot of other motives).

For the swords themselves, perhaps he doesn't use them, but holds them for passive magic enchantments?

As he is already a leader, +1 menacing is a good one. For the second, +1 Allying, combined with the Magus casting Greater Magic Weapon on it daily, is a solid combo as he can transfer it to a minion or to his unarmed strikes (Defending is an alternate for better AC). Make either one an APG dueling weapon for some misc boosts.

For the one he doesn't wield, depending on the party's choice of spells, either +1 Domineering (anti transmutation) or +1 Jealous (anti negative level) both work when carried (you could potentially even use it as part of his motivation).

[Jesuncolo]

WOOOOOH, that's great!
I've never read the Qinggong before today, but looks nice! With Sensei it would be an expert buffer. Share Memory and knowledge spreading is philosofic and deep. I bet it's ok. I should work a little deeper into his motives, but sounds really good.

I'm going to re-read the weapon enhancements, don't want to add too much power, but I don't think they're going to be broken in my campaign, and passive bonuses are cool.

What stats should he have? Either 25 point buy or 30. PC all have 25, and he's the BBEG.

[Tormad]

Give him 25 or even 20 and then the advanced template imo. He is supposed to be strong and the template will help even out some of the MAD of monk.