As a HUGE fan of Operation Crimson Hammer, I think we need a new expansion mission. When I first got the expansion, I assumed more missions would be added. That never happened, unfortunately.

Herex:
When the mission "A New Threat" came out recently, I went right to it. When I saw Herex, I was in awe because he looked like nothing I had seen before. My idea is to create something similar to Operation Crimson Hammer, but for Herex instead of Seerus.

The Rewards:
Instead of the hammer, there should be a Nightmane Stalker Saw that inflicts Poison and does Shadow damage. The charge attack for the five star version would throw three saws, like the Tier 3 Nightmane Stalkers, but the three star and one star versions would only throw one. I'll leave the name for you, OOO.
The second weapon would be an elemental Poison gun that is similar to a Valiance. The shots would have an animation similar to the shots of Sick Puppies, and the charge attack would be similar, too. The charge attack for the one star version would be one powerful shot, with the animation of the Sick Puppy shot, but a bit larger. The three star would shoot three of them, and the five star would shoot five. These charge attacks are based on the Gun Puppy shots in Tier One, Two, and Three.

The Mask:
Similar to Operation Crimson Hammer, there would be materials that you need for the mask. This mask should have very similar statistics to the Seerus Mask, but the opposite. This would have protection against Normal and Shadow Damage, would have Max protection from Poison and Freeze, and Medium weakness to Fire and Shock. Also, it would grant Charge Time Reduction: Medium and Attack Speed Increase: Low for swords, similar to the Seerus Mask with guns. It would look very much the same as the Seerus Mask, but the Crimson Order symbol on the head would be green instead of red. Also, all three versions would glow slightly green, and the Seerus Masks would glow slightly red, to distinguish the one star masks.

The Monsters:
Alright, this is the obvious part. :P The mobs would be virtually the same as Operation Crimson Hammer, with a few differences. Here is a list of ones that are currently in the game. There will be another list below it of new mobs.

Sick Puppies

Rocket Puppies

Gremlin Thwackers

Toxic Mortafires (I have never actually seen one, as they are only found in Compound 42 in a room that is random)

Gremlin Menders

Battlepods

Poison Knights

Monsters to be added for this mission:

Toxic Nightmane Stalkers

Vile Gremlin Demos

And of course... Herex! Even though he is already in existence, he will need to be capable of doing damage and receiving damage, of course.

It is a bit long, but whatever. Feel free to add on to my ideas!

~Monoxide