I present to you one of my latest creatures: Greed. On the left side of the picture you see a healthy Greed, unable to absorb any more nutrients but storing them inside of its body anyway. As a consequence, it is a normal occurrence for Greed to have misshapen body, deformed by the amount of undigested food stored within. Some of the little green fellas might even be alive in there.

Whenever Greed receives any damage, some of the nutrients are absorbed immediately and used to heal the wound, giving it great regenerative ability as long as its belly has any food in it.

Other creatures often get confused about Greed and won't see it as an enemy but rather as a source of food: instead of attacking it they would rather rub against it in hope to get some of the nutrients inside. Ironically, that usually means they are chewed to pieces and added to the Greed's food storage. However, sometimes a small creature makes its way inside while remaining alive, occupying one of the two stomachs (pic on the right). That creature then has an opportunity to feed on whatever Greed can't absorb and grow within like a parasite. Because of above-mentioned confused reaction, parasite creature will not attack Greed even if it grows some combat parts. That relationship, however, doesn't need to be parasitical: as the inner creature grows through the Greed's body, its combat parts can stick outwards and later used against enemies, giving Greed additional protection.

Oh wow, these are absolutely amazing! Would love to see them in action :)

Too bad mines don't do impact damage, only poison. I understand it's to make ranged weapons not too op but damn I wish that shotgun creature actually destroyed something on hit...

Sailor. Did you know you can propel yourself forward by blowing your insides outwards? Neither did I, but apparently you can. (pic on the right is the process of self-propelling, I synchronized both dash and blow abilities by linking them to same key and the speed is spectacular).

Spikes would fit better with this one, but I only had pincers. And I like pincers, in case you didn't notice already.

This is a new highly organized organism with a number of improvements!  This small coelenterate is extremely tenacious and has a number of beneficial properties such as:
 The endoderm is densely covered with spines that protect against most physical attacks.
 The structure of the oral ring allows food reserves to be stored for a long time and, most importantly, not to be lost during movement.
 The food reserve serves as a bait, entrapping unlucky organisms directly into the beak, one bite of which with no difficulty will rip even a great enemy!
 A secure rotary system allows you to quickly rotate in place.

Этот новый организм уже не новая структура.
Устные устройства максимально упрощена, для того, чтобы увеличить внутренние полости тела.
Большая полость тела заполнена питательными веществами для быстрого восстановления и маскировки.
Поверхность тела покрыта всасывание волосков, которые способны крепко ухватить и разорвать несчастную жертву в то же время регенерации здоровья.

I've managed to refine the Don Quixotting method of hunting with this creature here:

Nicknamed "Sledge-Hammerhead", its streamlined body houses 4 Don Quixote-Engine units (each consisting of 3 pusher-type Eater zooids and several Structure zooids) and is lined with rattler-type Swimmer zooids (as a turning mechanism and for smaller movements) and stunner-type Eater zooids (to stun any flanking enemies and to increase energy regeneration due to absurd energy consumption of the 4 aforementioned "Engines"). Its namesake comes from the biological battering ram that shields its head --- a far cry from previous Charger-type creatures that I've made discovered. It is significantly larger than most other charger weapon types, and boasts a unique "spring cushion" design (cushioned by more spikes?!) that acts as a sort of "insurance" for the creature in the event the front of the weapon breaks off. So far, that event has never come to fruition, as the design is thick enough to support itself on its own. Any wondering opponent in this thing's path is sure to experience a painful predicament  --- provided they come out alive.

Recently, there have been reports that the Big Bad of the "???" species adapting and evolving, so as to suit its sessile nature.

I've decided to capture one specimen and experiment on it (not to worry, there are a few instances of said "Big Bad", commonly referred to as a "Boss". How else does one always seem to encounter one right after C'thal?), however, the process of removing said specimen from the environment did require me to cut out all of the "enclosing" section of the specimen, leaving the "head".

After some tests in a tank with rival species and an automated feeder (i.e. Free Roam), the results were rather worrying...

...

Oh dear.

Here's a small summary of what transpired:

1. The "Head" slowly sprouted movement zooids after sitting still and receiving a lack of prey/nutrients.

2. After gathering enough nutrients and preying on any nearby siphonophores, it began to re-grow its signature enclosing wall of zooids. However, there are visible differences between the sessile variant:

     - The walls are not spaced as far apart as that of a sessile specimen.

     - The outer side of the walls are saturated with Movement and Eater zooids.

     - On the other hand, the inner side of the walls are lined with Leech and more Eater zooids.

     - There are no Spawner-type Eater zooids (distinguished from its Stunner counterpart by their dark-red colour) at all.

     - Finally, of course, the walls are not fully enclosed.

It continues to prey on whatever I can throw at it, as none of the siphonophores even dare to attack it. Unfortunate Advena specimens that accidentally brushed their spikes against it receive immediate retaliation by being torn into shreds by the many Leech zooids on the inner walls. On a side note, this thing can turn surprisingly fast!

In conclusion, the "???" species as a whole appears to have an absurd rate of adaptability, using whatever means necessary to survive if push comes to shove.

As for this monstrosity, I shall give it a fitting nickname:

The Herculean Executioner.