Alright, I got bored, so here's some of my ideas with regards to a Devilite Boss (yes, already done to death, but here's some concept work):
http://imageshack.us/photo/my-images/716/devilvx.jpg/

The existing topic is here, for reference, but I'll be showing off my own ideas mostly. http://forums.spiralknights.com/en/node/22720
I'll be repeating some of my ideas here to save you guys from scrolling down that page again.

The boss will preferably be in T3, and the levels will collectively be known as Devilite, Inc.

Stratum Level 1: Lucrative Lobby
The level starts off in an unimpressive cityscape, as you make your way to a massive skyscraper.
In the courtyard, you will trigger a party button that sets off an alarm, summoning waves of Devilites and Security Devilites, special Devilites clad in guards' uniforms and caps and only possessing one attack: a taser that can deliver a nasty shock along with elemental damage.

Following which, you will enter the compound's parking lot, where you will (unsurprisingly) fight your way through Devilites.
The main "Battle", however, takes place in the lobby; where you are met by four receptionists at a long reception desk. You will be perched at the lobby area while the receptionists hurl bombs at you; you will have 3 seconds to hurl them back just like you would a pot, and finish off the receptionists (they can only be damaged by the bombs).

Defeating the receptionists calls forth 3 waves of Devilites which you will have to defeat before entering the elevator to the next level.

Stratum Level 2: Wretched Workplace
This level is the first to incorporate Cubicle Warfares.
Firstly, you will encounter one Cubicle Warfare before the next area, where you will have to navigate past a treacherous labyrinth of filing cabinets, printers, and flying paper plane memos.
Another Cubicle Warfare will then appear, this time spawning two Internites (since you won't find many heart crates around here), followed by another puzzle involving flying paper plane memos.
The final battle pits you against one Supervisor, with a single watercooler in the center of the room.

Stratum Level 3: Ominous Office
This level is more annoying, given that one Supervisor will constantly follow you throughout the entire battle. You can take him down if you wish, but another will eventually take his place.
Two Cubicle Warfares will be given back to back, followed by a 'dark section' of the office as it blacks out. You will be completely unable to see enemies save for lights that flicker at fixed intervals - use that to traverse safely across the next section with flying memos and Kiosks.
After the lights are switched back on, you will be at a party button where waves of Devilites and Kiosks will confront you. Again, the Supervisor will be trailing around, dropping pencils on the unwary.
Following that, you will encounter two more Cubicle Warfares before entering a conference room. You will then be given a time limit for each wave of Devilites summoned - 45s for 3 to 4 members and 60s for solo or 2 members, to defeat all the devilites in a wave. Otherwise, they will turn into invulnerable Golden Devilites. This will proceed for 5 waves; with the composition of Devilites as follows:
Wave 1: 6 Devilites of various types
Wave 2: 4 Devilites, 2 Overtimers and 2 Pit Bosses
Wave 3: 4 Devilites, 4 Overtimers and 2 Pit Bosses
Wave 4: 5 Devilites, 5 Overtimers, 2 Yesmen and 2 Pit Bosses
Wave 5: 6 Overtimers (no timer in this wave), 2 Trojans.
After the Trojan wave, all Golden Devilites are killed, and the gate to the elevator opens.

Stratum Level 4: Sinister Skyscraper
As you rise up closer to the top of the building, the memos start piling up and flying around from every single corner of the office, so be careful.
You will encounter two Cubicle Warfares, separated by a maze of Kiosks and memos, before moving on to a more annoying section of the office - a large lobby party button with two Golden Trojans. Throughout the entire battle, you must defeat 4 waves of Devilites (and two Supervisors) before the gate opens and the two Trojans are destroyed, yielding 6 hearts each.
Two more Cubicle Warfares will occur, followed by another party button. This time, another mini-game takes place: the Kiosk Minigame:4 empty kiosks spawn around the office, and up to two members can enter a single kiosk. Golden Devilites will rush out of the gate you entered from in an attempt to get into the break room, and you will be residing in the kiosks hurling paper at them. Each Devilite struck by paper will then rush back out of the gate, otherwise they will enter the break room. 3 rounds of 6, 8 and 12 Devilites respectively will pass, followed by a confrontation with the Devilites that entered the Break Room (except that they are now no longer golden), accompanied by two Yesmen, two Pit Bosses, and one Supervisor.
Three more rounds of 6, 8 and 12 Devilites will pass, this time requiring you to shield as Devilites may hurl paper at you; otherwise you will be knocked out of the kiosk, and if any kiosk is empty, it will be commandeered by Devilites. Following the three rounds, you will fight any remaining Devilites and Kiosks, accompanied by 2 Pit Bosses, 2 Supervisors and 2 Trojans.
The gate to the elevator then opens.

Stratum Level 5(boss): The Head Honcho
This is where it gets tricky. The CEO itself has several phases, as shown below:

Phase 1: Desk Phase
The CEO will reside in its desk. Simple enough, hitting the Desk will damage the CEO.
He will have the following attacks:
- Stationery Barrage: He will throw a barrage of stationery sweeping from left to right, or right to left. The only way to avoid this without shielding is to stand behind the pillars, otherwise shield and try not to move.
- Ground Pound: As he flies above the desk, get ready to shield as he smashes back down onto the ground, dealing up to 8 bars of shadow damage and sending everyone flying back.
- Call Internites: He will summon up to 2 Internites to get him coffee - defeat them before they reach the desk or they will heal the CEO for up to 1,000 points of damage each. Internites only give 3 hearts when killed.

Phase 2: Flight Phase
The CEO will then get up from his desk and fly around; during this time the only way to damage him is to hit him while he is down, or use the golden braziers around the office to burn him, similar to the watercoolers for the Supervisors. He will be accompanied by 4 respawning Supervisors, 2 Overtimers and 2 Kiosks, and have the following attacks:
- Pencil Rain: The CEO rains down 8 explosive pencils in a straight line.
- Ground Pound: The CEO stomps down onto the ground, knocking everyone back but immobilizing himself for 5 seconds; you can attack him during this time.
- Haze: The CEO generates haze of a random status type (except sleep) below him as he flies.
Damaging him sufficiently will allow the team to move on to phase 3.

Phase 3: Desk Phase
This time, the desk will be laced with spiked pencils, that appear and disappear at regular intervals, like spikes. Memo planes from the front will now fly around the office.
The Stationery Barrage attack occurs at a much faster rate. The CEO will also call up to 3 Internites in this phase, and gains the ability to hurl explosive pencils in a cross-formation.

Phase 4: Flight Phase
Security Devilites will now rush in at regular intervals, along with 2 respawning Trojans. 4 Kiosks spawn in this phase.
The Pencil Barrage attack occurs at a much faster rate, and the CEO becomes immune to the braziers.

Phase 5: Desk Phase
The CEO turns into an ominous shade of pink, amplifying his skill power tremendously. Memo planes now fly from the sides, and the CEO can drop filing cabinets and printers onto random points of the battlefield; although they collapse after a few seconds.
The CEO's secretaries will now chuck bombs from behind just like the Lobby's minigame, and golden devilites will randomly rush around the field along with Security, 2 Trojans and 4 Supervisors.
- Stationery Barrage: The Stationery will be thrown sweeping from the center to the sides.
- Fist Pound: He now pounds the desk three times in quick succession (and lots of anger).
- Call Internites: He will summon up to 4 Internites to get him coffee.

My levels will also be incorporating a few new elements, as shown here:
Cubicle Warfare
Basically when you enter certain parts of each level there will be an area filled with occupied office cubicles with about 8 to 12 Devilites working away (probably mix the types up a little for Levels 1 and 2), and one patrolling Pit Boss.
Simple enough, the Pit Boss is pretty oblivious to you, as with the Devilites in the cubicles, until the Pit Boss is attacked.
At that point, the Devilites spring out to attack you, or to defend the Pit Boss (I'll explain this point later). This is the only time you can attack the Devilites.

What makes this battle even more challenging is that Devilites on low health may try to escape to a door stating 'Break Room'. It's recommended that you kill them before they enter, as Devilites entering will escape from the battle altogether, earning you no rewards. More importantly, when encountering another Cubicle Warfare zone in the level, all escaped Devilites will rush out of the corresponding Break Room at full health as reinforcements.

Thus, if all Devilites in the previous Warfare escape, you can move to the next, but you may face up to 24 Devilites and 2 Pit Bosses in a small area. Not good.

New Enemies
Here are some of the new enemies that will appear in these levels:

Kiosk
The Devilites' answer to turrets. Basically a square-shaped cubicle with two Devilites within, they will hurl random office stationery at anyone unfortunate enough to pass by.
The good news is they only hurl one projectile at a time. The bad news is they can hurl in two directions at once, and the projectiles travel fast.
Worst of all, destroying the Kiosks will unleash two furious Devilites.

Supervisor
This high and mighty pink Devilite flies high above the action, overseeing all of his subordinates' work. Occasionally, he might just get thunderous enough to rain down giant explosive pencils (similar to rockets) onto unwary Knights.
Unfortunately, there's only one way to get rid of him; and that is to rig a water cooler to splash him, sending him hurtling down to the ground.

Internite
Diminutive, defenceless white Devilites who frequently rush in and out of break rooms to deliver coffee and donuts to his superiors. While lacking in defence, they make up for it with amazing speed, even surpassing their purple counterparts. Take one down, however, and you'll be rewarded with a surplus of hearts.

Pit Boss Benefits
As the Pit Boss' home territory, all Pit Bosses in these levels (maybe except for the boss one depending on circumstances) gain additional perks:

1. Calling for a 'staff meeting'. This calls all nearby Devilites to congregate near the Pit Boss, attacking all knights that stray too close. Generally trying to prolong its lifespan.
2. Firing Employees. When given the chance, a Pit Boss may effectively deny you a Devilite kill by 'firing' the employee for you, granting you no rewards. This will not occur in Cubicle Warfares, and luckily for you the animation for this takes quite awhile, so kill the weak Devilite quickly.

Obstacles
What is a CEO's office without its own unique obstacles?

1. Invulnerable, golden Devilites that rush around the office with huge stacks of paper. Crashing into one makes you lose up to 3 bars of health.
2. Filing cabinets may collapse randomly, dealing 2 bars of damage and stun. More as just a nuisance - basically look for the shaky ones, and backstep just before it hits you.
3. Flying Memos - in the form of paper airplanes, more prolific as you approach the CEO's lair. Each one hitting you deals half a bar, but be warned that eventually they will flock in large numbers.
4. Printers - printers will churn out massive quantities of paper in one direction akin to a flamethrower, dealing up to 4 bars of health in damage.
5. Loose electrical cables - stepping on one as it electrocutes will shock you and deal 3 bars of health in damage.

Feel free to give comments and suggest suitable rewards. Right now I'm thinking of Corporate Credit as a token name.