Well this is how I would create this shreck gun.

Visuals

First it would be shaped like shreck’s ear where the smaller part of shreck’s ear is where the handle of the gun goes, and the larger parts of shreck's ear would be the muzzle.

Mechanic

Normal attack

* The gun's normal attack would form floating bubbles that explode when come in contact with a monster or object. These floating bubbles however do not go the direction of where they are being shot. Instead, they just FLOAT AROUND the place going which ever direction they want.

The player can create a maximum of 20 bubbles and the gun has a 2 shot reload time. Each bubble will stay on the field indefinitely until it explodes from contact with a monster/object or until the maximum number of bubbles on the field has been reached where the most previous would explode when the new one is created. Also the fire rate is as fast as a Blaster gun, but the firering type is like a Punch gun. So whenever the knight fires the gun, they would have to stay still for that one moment like the punch gun.

Because of this fire mechanic, this gun might be labeled an extremely close up range weapon that may be unreliable.

Charge attack >/em>

* Main function

The charge attack would fire an earwax rocket missile that when lands on the monster attaches to it like a sticky bomb/catalyzer bullet. This earwax rocket missile will fire at the same speed as the Iron Slug bullet. Once the earwax rocket missile impacts and attaches on a monster/target, it will cause some damage and knockback. After 5 - 8 seconds has passed, the missile will explode causing additional damage.

*side function

The additional side function of the charge attack will pull in all the existing floating bubbles to the target that has the earwax missile stuck on it. These floating bubbles that are pulled in will be pulled in through walls and obstacles and will act like the grimalkin ability to go through walls and other monsters. All of these bubbles will not explode once they make contact with the targeted monster/knight that has the earwax missile stuck on it until the ear wax rocket missile explodes.

* Additional side function

For each bubble that is stuck on a target, the target will speed will slow down. If 5 or more bubbles are stuck on a target, one offensive gear/ability that targets has will be banned till the bubble explodes.

*additional side function

Each floating bubble serves as a deterrent/obstacle to a target/enemy that is moving on the field. So each target/enemy will have to be wary of the location of the bubble so as to not get in contact with that bubble. This in a way is field controlling.

* Additional negative function

These bubbles can be slashed with a sword's normal attack as long as the player has not initiated the charge attack. So the target/enemy will have to get very close and time it right to destroy the bubble without getting hurt. Sword Charge attacks and long range gun attacks will not cause the bubble to explode.

*Additional side function.

Only bomb attacks can go through the bubble. The bubble blocks all other attacks from going through.

Statistics

The shreck gun will be a split between normal damage and elemental damage plus poison status. It can also be a split between normal and shadow with the ice status. Or just pure normal with the fire status.

The gun can go from star 3 to star 5 where the star 3 can only put out 10 bubbles, star 4 15 bubbles and star 5 20 bubbles.

Well, how do you like how I modified your idea?