I've been contemplating these two idea's for quite awhile and I think it's time to reveal them.

Tier 3 Idea:
The Crimson Order, King Tinkinzar's loyal gremlin knights headquarters have been revealed! The knights must inflitrate this large facility and bring an end to the plans to destroy Haven!

Each floor of the crimson order will be primarily Gremlin themed, along with constructs. However, a new special rank of gremlins will be in this area only, but will basically be a reskin of tier 3 gremlins. These will be Crimson Order Gremlins. At the end of each floor, there will be a party button and when activated, you and your party must face 4 waves of monsters. The 5th wave will consist of one gremlin, this gremlin will be the 3rd highest ranking member of the entire Crimson Order. This gremlin will act as a miniboss and will be a bomb gremlin that will have entirely original movesets. The next floor consists of the same, however the miniboss at the end of the level shall be the 2nd highest ranking member of the Crimson Order and will be a special Hammer Gremlin. Again with it's own moveset.

The boss of the Crimson Order area will be the highest ranking member of the Crimson Order and is it's leader. (Not King Tinkinzar, he commands the order and is technically not a part of it.) He will call upon both of the other two members at random during the fight and will also call upon mending gremlins to heal him. I suppose he could use something entirely new, maybe a handgun or machine gun?

Final Tier Idea:
The final path. This is what we've been working for, and now it's our moment of triumph! Race down the final path and reach the core! But beware. We have been getting strange movement near the entrance to the core. Keep on your toes!

The final tier will be after Lord Vanaduke or the Crimson Order is defeated. The Final Tier will be longer then the other tiers, as it will have all the themes. The last floor, at the very entrance to the core will house one boss.
King Tinkinzar.
This will be his final defense against the Spiral Knights, and will fight full force to protect Cradle's core and eliminate the Knights once and for all!

King Tinkinzar will start the battle by simply overlooking as he sends hordes of Crimson Order Gremlins at you. After defeating all waves, he will jump into a large tank (The cannon of said tank will look like a gun puppies head as a reference to the roarmulus twins.) The tank stage will consist of him attempting to blast all the knights with projectiles and missiles, and knights can also take massive damage by colliding with the tank, as it has electric spikes all over it. After the tank is beaten, King Tinkinzar will jump inside of it and begin to alter it with his tools. A helicopter blade will burst from the top, and the tank will break multiple pieces off to form a small helicopter that will fly around the room spraying bullets and bombs everywhere. (it will still be hittable with swords and bombs since it is only hovering above the ground.) After the Helicopter is destroyed, it will self destruct and King Tinkinzar will hop onto the ground in full battle armor, ready to take on the Spiral Knights himself. He will have a sword and a rocket launcher which shoots 3 homing missiles at a time. He will randomly switch between the rocket launcher and sword during combat, and has a pattern for each weapon.
With his sword out, King Tinkinzar will wildly dash across the arena, slashing at any knight within his reach, stopping for a moment to catch his breath after finishing a dash. He will also stab his sword into the ground which will shoot out balls of energy that deal elemental damage and cause shock.
With his rocket launcher out, King Tinkinzar will rumble across the arena slowly and fire bursts of homing rockets. Occasionally, he will slam the rocket launcher into the ground and push any knights near him away from him. The rockets will cause fire status while his slam attack can cause stun.
Finally, after being defeated, King Tinkinzar will fall and it will be up to three ring and sega to decide what happens next!

Well. That's my idea! Bring the criticism on!