Okay, this isn't really much of a suggestion- just what I think would be cool new add. I know that OOO will never implement full on boss ideas...
WARNING: WALL OF TEXT
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Mission Description: Vaelyn: This mission is critical to the alliance between Emberlight Gremlin rebels and the Spiral Order. Upon locating a new refugee camp in the frigid zones of Cradle's underground mountains, Feron initiated a military presence in order to keep the region from going hostile. However, such measures provoked the Crimson Order head technician Trezek to construct a mobile fortress to destroy anything in its path, including the Emberlight camp. It is already too late to salvage any surviving camps from the south, but Feron's camp is in the path of this mammoth of a destructive force. It is your mission to end this monster in its tracks before Trezek can get the fortress to Feron's location.
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Mission:
MISSION BAY: The location is on a frozen clifftop. Vaelyn says she's glad you were there to help, and that Rhendon has already left to stop this catastrophe. The mission is on the same ground level, but there are areas that you must cross in order to get to the next level. Emberlight refugees are scattered throughout the location, and may assist you. Be careful.
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The Great Pursuit: Backtracked
Your party starts off on a ruined place that looks vaguely like Emberlight, except now frozen over and... well... flattened. The Spiral Order has set up a temporary base, but it is your job to follow the disaster trail and take out the Constructs and Undead that have been lurking under the city. The location is linear, and there have been no efforts to slow you down except for Ghostmane Stalkers. get past this heap and salvage any surviving Emberlight Gremlins to get to the next area. This place is lengthy, but linear.
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The Great Pursuit: Those Who Were Left
A cutscene starts where an Emberlight Gremlin gets killed off by a running Ghostmane, but others come in to take out the Ghostmane. Talk to Gremlins there to find out that this place has been barely left alive, but Emberlight has made a push to chase after this. Gremlins, Fiends, and Ice Cubes are all over this map. Unlike the last one, this area has been left guarded and twisted by Thwackers and Mortafires. In one road, you need to free Gremlins to get a key to open a double-locked room. In the other road, you aid the Gremlins from being attacked by Ghostmanes. You open the small room and press a button to get rid of a ton of junk blocking your path on the real city. After you clear that out, a Gremlin by the name of Keglar surrounds you with rocket Puppies and a generator that is said to put the city to the ground. After a while you open more rooms, save those Gremlins to help you break from that ambush. When Keglar flees, a Gremlin says that they will no longer hide, but aid you to stop this tyranny. You are allowed to pass.
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The Great Pursuit: Fight for Right
Another cutscene introduces you to an army of Gremlins being over run by rebels, but Keglar manages to get the loudspeakers to rally loyalists against the rebels. In this area, it is overcrowded by Construct security, including hordes of Mechaknights, Retrodes, and Gun Puppies. Your mission is to find your way out of this mess. In order to do that, you must find switches and turn them off or on to deactivate generators that allow unlimited spawning of these robots. Freezing Mortafires and Menders are plentiful. Destroy the six generators, and find the rally point where Keglar is at, he, again flees, leaving you with barely recruited Thwackers and Ghostmanes. If you do not kill them here, you must kill them in the next level prior to the cutscene.
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The Great Pursuit: Uprise
After killing the newbies, a cutscene enters where the Fortress continues to roll through the city. The fortress is just immense, so you only see it going away in the distanced fog. However, right after it leaves, you see Keglar erect a frost version of a Roarmulus turret, with him on it, wand ready for healing himself and his allies. To enter, you see several Emberlight Gremlins take on loyalists, and you may aid them to get the loot, but this is not the battle. Once you get to the center of the city, the place is blocked off, with the rotating Frost Roarmulus in the center, surrounded by four Battle Pods, north, south, east, and west. Gremlin Mortafires come in packs of five, and the megapuppy rotates according to the shield deactivation of the Battle Pods (which can release freezing mist) and shoots homing rockets or freezing lasers. Destroy the Battle Pods to reveal switches which launch rockets placed by rebels towards the megapuppy's back according to where the switch is. When it hits, the megapuppy falls over, dropping the guy and you may smite Keglar there unless you're slow and he returns on the megapuppy. Once Keglar is down, a few rebels, including one that has been mentioned by Seerus in his mission, appear. Their chief says that the mission has not ended, and the Fortress is still moving. He wishes you good luck.
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The Great Pursuit: Epicenter
A cutscene shows that your party is running up the gargantuan machine and the party jumps on via the wheel, but then shows the lengthy path the machine must take. The cutscene zooms to the distant camp, into a silhouetted Knight's point of view, him saying "Soon..." and he walks away. Inside, you battle your way through corridors against Gremlin Ghostmane Stalkers, Thwackers, demos, Scorchers, and new Gremlins which don't attack, but block their allies known as Barriers. There is an area where you get trapped by a ton of random Kleptolisks, but sure enough, it's a cutscene where Trezek says "Another?! My, my. what more fun!" through loudspeakers, but when that ends, Rhendon appears and blitzes the Kleptolisks away, allied with one Gremlin and a Knight and says that he is going to assist you. A few more corridors and you appear outside, for another custcene, on the roof of the mobile Fortress. On front of a huge laser, Trezek jumps down to injure the NPC Knight, and commands several Ghostmane Stalkers to take you out. Rhendon commands the Fortress to halt or they would meet dire circumstances. Once Trezek demands that he would never back down, in the name of Tinkinzar, the injured Knight drops a Nitronome back into the corridor and the room explodes. Further away, the cutscene continues to show that the rest of Rhendon's team does not know how to control the Fortress, and that one of them shoots the computer in frustration, rendering the entire fortress disaster-bound, leaving the laser cannon firing random shots of pure Energy capable of knocking out any shield. Back to your location, Trezek roars in frustration as the battle commences after light brightens the screen
Boss battle! The light fades away, showing that Trezek is in a huge, fully shielded suit. He plays as a demo, capable of slightly healing himself every once in a while as well as reviving others, also dealing elemental. In that room, two Mortafires, four Barriers, and eight continuously replacing Gremlin Ghostmane Stalkers appear. To aid you are Rhendon and the Gremlin. On two sides, the Battle Pods are completely shielded, but only freeze and launch upward rockets. the goal is to make sure Trezek is bumped into the laser cannon and shield-broken. Once that happens, he takes out his Wrench Hammer to spin away any nearby foes, after that, you have a few seconds to kill him. Eventually, you would kill him, and hope that the Gremlin, Rhendon, and other Gremlins won't get in your way. After you kill Trezek, his suit starts to explode and yells that he failed Tinkinzar, and he finally makes a huge explosion. Rhendon tells you to hold on tightly, and shoves you right off the front of the Fortress, and he and his Gremlin fall off. A cutscene continues that the front of the fortress digs right down into the ground, grinding into a halt, launching you and your party onto the camp, just in the nick of time.
The Great Pursuit: Aftermath
Rhendon and his party are being healed, and the Gremlin chief comes to speak to you, but you must talk to him before you go on. He gives you Emberlight Rebellion Insignias for aiding in the fall of the technician and the revolution (which can be used for whatever craftable item exclusive to the mission). Feron gives you kudos for taking down the machine and that no one would have done it otherwise, that he strictly forbade any of his men to be killed in this fight....

This is a replayable fight for all 3 tiers.
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well, what do you think? (@Rawrcake, I know you may not read this, but your conspiracy kinda put some etchings into this...)
BTW the names are based on back, left, right, forward, and center. (Backtracked, Those who were left, Fight for right, Uprising, Epicenter)