I had stopped posting or reading on the forum for some time however; I've had a few random, and unique ideas for Spiral Knights lately. Usually while I'm either bored at work, listening to music from other video games, etc. This is a rough draft idea, I just wanted everything written down, or in text. This is the collaboration I came up with

Bosses aren’t going to be recycled, 4 bosses will be implemented. All bosses are immune to status affliction, strike hard in their area of expertise. Each of the entry keys would be ultra rare, and be random drops off of Tier 3 monsters OR Tier 3 danger room vaults. There will be 4 elemental keys in all, and would unlock this area - for 1 dive. This is a prepare to dive, more preparation than a shadow lair would require. Cost to enter is high, but with heavy risk carries high reward. Legendary equipment, and unique accessories. 1-4 players may party up, and the same rules apply from the shadow instance; no one different may join the party, you're stuck with what you start with. Armor, Weapons, Accessories. Everything.

Earth Stage, Sacred Meadow – Gauntlet oriented 3 stage arena, having a boss after being worn down.
Warlord Masamune, Alpha Wolver Attack pet. Masamune can send wind shears or shockwaves by swinging his sword. He can also do a lightning fast charge attack in a straight line. However shielding negates the shockwaves but is instantly broken from the charge. The wolver can also inflict stun, fire, and poison all in his bites. (Normal/Piercing damage)

Water Stage, Behind the falls – A puzzle oriented level, with a boss who uses AoE water attacks
2-headed Hydra, occasionally shrieks summoning 4-6 non-elemental greavers to the battlefield. He will occasionally come close to release breathe weapons of either toxic, shock or stun (Normal/Shadow Damage)

Fire Stage, Fury within the Blaze – An unforgiving nest of traps in the level test your patience, and your skill. Ton’s of status effects, fast monster traps, and plenty of drones, greavers, wolvers, and explosives.
Goblin Genius, uses many long range attacks with guns, drops and sleep gas bombs. This boss will be tricky and evades very well. (Normal/Elemental Damage)

Wind Stage, Forgotten Ruins – A puzzle and combat oriented level, crawling with constructs, and strong mechanical creatures.
Legendary Hero, Dual Wields Gran Faust and Divine Avenger. Sending out charges for 2 players on an incredibly short charge time. After he hits ¼ health he steps back in a boss-style cut-scene, and combines the 2 swords into a Blade of Aether. This new great sword is faster, and it’s charge is a very quick overhead 2-handed swing that releases a shockwave in a cone in front of the wielder.

After the defeat of the Legendary Hero, he falls to his knee, and admits defeat. He awards you access to his treasure vault, and his alchemy station. The new set of weapons and armor would be legendary tier. Legendary tier armor and weapons also lose all of their previous Unique Variants upon being crafted. Each craft would cost 2000CE, and the prerequisites would be 1-2 level 10, 5* items and many materials.

Shogun Crest: High Normal, Piercing and Elemental Defense, High resist to stun, ASI Medium
Yata Armor: High Normal, Piercing and Shadow Defense, High sleep, stun, and curse resistance
Kusanagi Katana: Very High Normal and Shadow damage, ASI High, Damage increased Medium
Seastone Shield: High Normal, Elemental and Shadow Defense, Max resist to fire, shock, and poison
Twin-fang Necklace: Chance for a melee strike to turn into a double-strike. Doesn’t stack with itself.
Coral Circlet: High Normal, Piercing and Elemental Defense, High resist to fire, shock and stun
Quasar (Gun): Can deal Any damage and status type in the game, Pulsar model, Double Tap block to cycle damage type. ASI Medium, CTR Medium.
Pandemonium (Bomb): Charge time doesn’t affect this bomb, affected area is inflicted with strong curse
True Love Locket: +7 Health
Blade of Aether: Maximum Elemental or Shadow damage. Double Tap block to cycle damage type. ASI Very High, CTR High. Charge strikes cost 1 bar of health.
Halcyon Gladiator Shield: High Piercing, Elemental, and Shadow Defense, High fire and curse resistance, movement speed increased low
Crystalline Gladiator Armor: High Normal, Elemental and Shadow Defense, High stun and shock resistance, movement speed increased low

I have a few ideas what could build into what. I.E. Omega Shell could turn into the Seastone Shield and be VERY useful. Just toss some ideas out, it's open to review, constructive thought, and please let me know what you think is good or lackluster.