Biology

The Enderians unique and ubiquitous skin is also the source of their weakness. The Enderians skin is made of millions of cellular structures called Alkali Cells. A type of cell structure that is known to be attributed to dead, or rotted biological mass that has passed through an Ender Rift, a temporal field of distorted space-time created when an Enderian teleports. These rifts are not detectable to the naked eye, nor is it possible to follow an Enderian through such rifts. The rift is only passable by the Endermen because of the composition of their skin, as it prevents it from being eroded by the rift as it moves through it.

This does however lead to a problem with contacting water. These cells are incapable of interacting with the element. The cellular structure begins to deteriorate when the molecules from the water are absorbed into the Enderians skin. This process starts to separate and break down the Enderians skin and internal organs.

On top of this species being weak to water, they have another distinguishable behavior. This behavior is in regards to their aggression and often violent tendencies when eye contact is made. Many perceive this as a territorial response, or an act of asserting dominance. They don't mean any harm by nature, so those whom do wish to remain docile and considerate towards others often counters this behavior.

Often times Enderians will be seen wearing masks, face coverings, covering their eyes more specifically. This breaks that direct eye contact, adding a layer between the gazes, making looking into the eyes of one of them more bearable and safe.

(Small adjustments made for my own lore, but credit to the original concept for inspo :Darkscript on the Minecraft Forum:)

Many of the subraces share the same composition, although they have each had their own adaptations to their living habitats. They have adjusted biologically to accommodate for survival, much like other species within the world.

So take the basic biology with a grain of salt when it comes to the subraces besides the original.

However one thing that is common across the race, the element they breathe differs from humans breathing oxygen. They instead breathe carbon.

Their primary lifesource is the pearl in the chest, which may seem like a hinderance for the subraces with it exposed. The pearl has a fortified shell with a major durability, sheltering the liquid core. This is what also allows them to teleport. They can live without this, at the cost of their teleportation and another organ, as this process of adaptation modifies a separate organ to take the role of a heart to keep the body functioning. This 'Second Life' is a final chance for the Enderian to exist, once they've grown old enough or have been damaged severely enough, their life would be no more.

Basics of Physical Image - 

Thin and lanky creatures, with pointed extremities. They have solid colored eyes often with a slight change in tone towards the center 'iris', and their mouth is not visible when its closed. Their undertone is determined by the variant, as well as some physical structure aspects. 

Many, depending on specific subrace, often can be seen with slightly raised and off colored finger pads, or 'toe beans'.

Their core, or pearl, can typically be seen on the center of the chest. This is used to assist in the Enderians concentration for their teleportation. Similarly to an arcane focus, this is a way for them to channel their magicks without draining their energy. This can also be a point of interest when wanting to incapacitate one. As it will eliminate their primary ability to teleport.

Diseases Brought by the End - 

Ender Sickness : 

Causes : Much like rabies, this can have a chance of contraction when bitten by a creature that comes from the End realm. Careful of what bites you, and keep bites clean and disinfected.

Symptoms : The world Looks.. different. Instead of all the vibrant colors, only blues and greens really pop out. Other colors are dulling, almost seeming non-existent. Growing fatigued, you begin a process like rotting. Demotivated to recover or get better, making this long process so effective. Curable via finding someone with Greater Restoration, Wish, or an Enderian willing to share their blood.

Blue Blood : 

Causes : Leeching creatures, if they leech on for long enough you can contract it. Major form of this can be caused internally if you accidentally consume a Chorusite.

Symptoms : Spots will be noticed around high blood flow locations, slowly turning spots of blue. Slowly increasing in amount until small blisters begin appearing in the mouth. Any form of bleeding occuring after contracting this disease will result in heavy blood loss. The blood despite any previous color will now be a deep blue. Loss of oxygen intake. Curable via finding someone with Greater Restoration, Wish, or if caught early enough by consuming a mix of charred warped leaves and nether wart.

Drainage : 

Causes : Shulk Wasps tend to carry this disease. One sting can lead to contraction. 

Symptoms : Dehydration, no form of drinking or liquid will seem to quench the thirst, easily can cause drowning from over drinking or even sharp throat pains from the liquids. Will go away on its own after about a week or two depending on severity. Just keep in mind to intake at least bits of liquids to keep your body functioning.

Void Flu : 

Causes : Consuming water from still water lakes in the Lavender Forests and Warped Forests.

Symptoms : Black tears and temporary blurred vision. You can lose all sense of direction when effected by this illness. Coughing, sneezing and nausea are common for this as well. Will go away on its own after a few days to a week.

Psych Warp : 

Causes : Inhaling or consuming the spores or certain flora of the Warped Forests. Those spores can often be put into a paste and the illness can be contracted through that means as well.

Symptoms : Warped perception. Who are these people? Where am I? You feel terrified, nothing feel familiar, no one feels familiar. If you need to fight when threatened, you will. Curable, only cured with clearing out the lungs and nose.