By drinking this essence you become the Unnamed Darkness, an ever-expanding, all-consuming foreign Entity.
*Your body becomes a strange substance that can change its physical state and doesn't adhere to all physical laws. Neither matter nor energy but something quite different.
*Regardless of state or mass, you are always able to fly. The gravitational pull of objects can't pin you down.
*Walking through time and space is as easy as walking through a room.
*In the beginning, your body will be a cloud, roughly the size of a large cat with physical properties to an average adult human. You can harden yourself to match iron.
*You possess the ability to transform your body into anything as long as you have sufficient mass to reach its size. A gaping maw with razor-sharp teeth, tendrils, a jacket or flowers. Creativity is key.
*The substance your body is made out of can make everything it can make contact with, a part of you. This behaves differently depending on the thing in question:
*Beings need to be killed before they can be absorbed. Upon death, they are automatically transformed into your substance and absorbed, provided you have contact.
*Every part of their being is consumed to improve you. Abilities, powers, knowledge, durability, aptitudes, mass, simply everything positive. Harmful aspects, like a weakness to fire, are automatically sorted out.
*If you, for example, kill an average adult human in your base form, you are two put into one. Twice the strength, durability, and brain processing power.
*Aspects that can't be simply added like reaction time, skill, or aptitude are instead improved. Having a reaction time of 200ms and absorbing someone with 250ms, won't make yours 450ms but rather 150ms.
*You are perfectly capable of mimicking everyone you have absorbed, down to their mannerisms and way to talk.
*Since absorbed beings are unraveled completely in mind, body, soul, etc. you don't have to fear them rebelling or retaining their personality. There is only you.
*Their memories will have no negative effect on you.
*Entities like ghosts or liches also count as living for this purpose. As do androids or cyborgs.
*Objects can be absorbed if you're capable of forming a surface large enough for them to fall through. This surface is extended from yourself.
*Your substance functions like a hole for this purpose.
*Should you want to absorb a tower with a diameter of 5 meters, you would need to create a surface with a diameter of slightly over 5 meters.
*You can sever the connection of objects with the ground with your surfaces if you would be able to cut through the material providing said connection.
*Objects that are not able to fall through, have to be encased instead.
*Contrary to beings, objects won't increase any aspects of you except mass.
*By default, they are not turned into your substance but stored. This can be changed to your liking.
*If an object holds power or skills, transforming it, will grand these to you.
*Liquids count as objects.
*Energy can simply be absorbed and released at a later time.
*More esoteric things like mana or spiritual, psionic, and cosmic "energies" can be absorbed to increase your own reserves or smelted together into one.
*Souls can simply be used as fuel or be unraveled to strengthen you. While still being able to possess skills from when they were still connected to their mortal shell, this is not guaranteed.
*After passing certain thresholds in your growth you will develop abilities on your own. These include: Space-Time Manipulation, Mental Manipulation, Omnilock, Creation, Nonexistence, and more.
*The stronger you become, the stronger the powers you unlock do.
*Beings can only fall through your created surfaces if they're weak enough to not pose a threat to you and are immediately killed and absorbed then. This is a safety mechanism to prevent destruction from within.
*Your Body is comprised of two parts. The first is the visible one through which you interact with the world. The second resides in an otherwise empty universe inaccessible and inviolable to anything but you.
*If the first part is damaged, substance from the second is drawn to replace the destroyed parts. This happens instantly and can't be prevented.
*The first part can be recalled to the second.
*Should you possess strong enough regenerative capabilities, you can stop the replacement process and instead heal with these.
*The second part acts as storage for everything that was absorbed and isn't used by the first. As a part of your body, it can also be customized.
*Stored objects are automatically organized and are unaffected by the passage of time.
*The connection between the two can't be cut or prevented. Chain reactions that affect the first part can't be transported to the second. For example, an effect that destroys all instances of a certain type of matter could only affect the first.
*Chunks of substances that are removed from the first part, like cut off limbs, are transported to the second.
*Anything converted can be rebuild and transported to you. Beings that have been rebuilt do receive their powers but not their personality and will follow your commands. You still retain the given powers.
*Due to your nature you can't be trapped, sealed, restrained by any means, and are unaffected by time manipulation. You're also immune to reality-warping since you're not a natural part of said reality.
*Being a foreign factor enables you to break the rules of the universes you visit. If you can do it is another story but the possibility is there.
*You do not possess a soul, hence any attacks that target it are useless against you.
*Your mind is built alien and strange so attacking it is useless. This extends to illusions and other manipulations.
*All this and the powers that you'll gain are part of you and can't be suppressed, altered, removed, copied, etc..
*Even if the name might suggest otherwise, your color pallet isn't restricted to dark colors.