RETALIATION
The Various monster families have had enough of your spiral knight tom foolery and each are preparing for you with devious rare new mobs.
These hard to find mobs are built to give you trouble, so you might wanna think twice, thrice...possibly a FOURTH time before tangling with them.
AN EXAMPLE FROM THE SLIME FAMILY:
The Jelly King realizes his massive gelatinous...body is not enough to repel the constant attack on his kingdom, and have created the:

DREAD JELLY KNIGHTS

The grand squishy lancer: Citrusius! This Jelly is orange, and has a helmet streamlined for speed. With a special spike lance it can rush down all but the most nimble footed of Knights, inflecting painful PEIRCE DAMAGE. However his helmet is a bit loose, so he sometimes he losses sight and rams into walls STUNNING him.

The crown prince: Haemosis! This regally dressed cube is not above using others to get what it wants, (mainly your DEATH). He spawns jelly cubes with an attack buff, and heals them (albeit very slowly) along with himself. Along with his ludicrous -see below- he has been dipping into his fathers(?) royal treasury sometimes dropping JELLY TOKENS.

The buffoon jester:Temaze! Physically weak, constantly creating obnoxious honks, and making horrible jelly puns he...well was more or less sent out to stop annoying the king. But be warned, beneath that jelly safe clown paint, a core of PURE MALICE lurks. Capable of inflecting RANDOM STATUS EFFECTS, he can even reverse your controls for a horrible LIMITED time. Dangerous? PROBABLY NOT. Annoying? YOU BET YOUR KESTER!

"But Weibbles, if these mobs are such trouble why would we even want to get near them? Surely they dont drop something I cant grind/buy?"

Well your half-right, but here's the second part of my SUGGESTION.

BOUNTY HUNTING

THAT'S RIGHT, THESE NEW MOBS POSE SUCH A THREAT THE SPIRAL ORDER HAVE PUT PRICES ON THEIR HEADS. These new mobs are a threat in the core research, and the retrieval of alpha team, so these (and all other rare mobs) have a nice fat crown reward upon their crushing defeat. Eliminating these foes can be a good way to earn a hefty sum, but there's MORE. In order to locate these baddies, all knights are issued a tablet. A BOUNTY TABLET. It contains a list of rare mobs you've seen, a probability score that shows which TIER/FLOOR you might find them. Unfortunately its not perfect, and its difficult to pinpoint their TRUE location, so sometime a high percentage isn't enough! By crafting a special LURE, you can up your chances of finding them!

Upon the first defeat you not only get the crown reward, but a small CE bonus as well(only on the first defeat for YOU remember?) Also you get a card you add to your tablet displaying a MUG SHOT, ATTACK ANIMATION, AND HUMOROUS PARAGRAPH. This also grants you the PROBABILITY SCORE, LURE RECIPE, AND REWARD METER. Defeating a certain monster enough times will fill it, giving you a PROBABILITY BONUS, ALONG WITH SPECIAL EQUIPMENT PIECE, or COSTUME!

"Weibbles, This sounds amazing, but your emphasis/capital letters are freaking me out! Also, why cards?"

I can't help it, its a BIT OF A PROBLEM!
The cards however serve a special purpose! Much like in real life, you can TRADE cards. You'll gain the information and probability charts of the other card while keeping your reward meter. However once you TRADE you LOSE your probability bonus and information. That said it is possible to have MORE THAN ONE of the same card, so collecting isn't impossible.

Why would you want to collect cards? A CARD BATTLING MINI-GAME!

CARD GAMES ON CRADLE? OH YEAH. (Warning, playing this on a motorcycle is not recommended.)
It plays a bit like rock paper scissors. You have the ATTACK CARD, STATUS CARD, AND DEFENSE CARD.
STATUS beats DEFENSE
ATTACK beats STATUS
DEFENSE beats ATTACK!
Take for example the Dread Jelly Knights.
Citrusius would be an attack card.
Haemosis would be defense.
Tamaze would be status.

Using three cards from the same FAMILY would give you a SWEET CARD BONUS, such as the Dread Jelly Knights would be a bonus that would allow you to beat one card REGARDLESS!

"Weibbles, your turning red, but I love what your saying!"

I don't know HOW MUCH MORE I CAN GIVE!

As a final note, I had the idea of a pvp mode called: THE DEADLIEST GAME!
You put a price on your own head and enter a MAZE LIKE ARENA with a LIMITED AMOUNT of hidden health pots. You and you opponents price are put into the PRICE POT, and the BLOODSHED/DANGER begins.
You hunt each other down, and the survivor win. Its one life only, so last knight standing gets THE PRICE POT. A round can hold up to EIGHT Knights, and the price minimum goes up with your over all equipment stars. FOUR star games can be ultra risky, but oh so rewarding. FIVE star games are even more intense, NO HEALTH PILLS can be found!
"Oh god Weibbles I think I'm drooli-"

I"M NOT FINISHED!

Those not in a match can participate in the HIGH ROLLERS CLUB! You may bet on who you think will win, and you can put anything on the table, there's no limit, CE? Crowns? Recipes? Unbindded equips? NO PROBLEM! Putting big money on the table might incite others so...

"Weibbles, Do you have any other monster ideas? Can I submit my own?"

SURE, I would love to see your idea's for a RETALIATION EDITION RARE MOBS.

Now if you excUSE ME I NEED TO TAKE A BREAK BEFORE I HNNNNNNNGGGG.

(Edited around a bit to correct spelling errors my OCD could not live with.)