Essence of the Doom Slayer
[*You gain a body fit for waging war against the denizens of hell, you are superhuman, able to tear demons apart with your bare hands alone.
Your body is unageing and will still be going strong even after ages have passed with nary a worry of you losing any functionality.
Your mind is just as sharp and wouldn't suffer being trapped for eons only fighting demons one bit.
*Your will is such that you could spend forever killing the legions of hell and not break.
There is very little that can even put a dent in your will.
In fact, all that would do is make you angrier.
This anger only makes you stronger making your more powerful the angrier you become.
You are immune to corruption and can in fact use items that would tear anyone else asunder into a jabbering husk or worse.
*Are a one-man genocide against Hell or anyone unfortunate enough to gain your wrath.
Zombies, possessed, demons, angels, it doesn't matter you are a brutal grandmaster of combat able to kill them all with your two hands and judicious use of a BFG.
Killing enemies with 'glory kills' not only heals you, but it also refills your ammo making you a practically unceasing engine of slaughter.
Anything you kill with a glory kill will stay dead.
You also know the Runes of hell and can make use of those as you see fit, perhaps even discover more in the future.
*Gain your own Fortress of Doom space station as a base.
It comes fully operational with any backdoors to its systems like the original closed.
It has all the equipment you could ever want including a Praetor suit, large selection of weapons like the BFG9000, Chainsaw, and Super Shotgun to name a few.
Anything lost or destroyed will be replaced after a day.
It even has a loyal copy of VEGA installed to the fortress to keep it running.
*Optionally you may be dropped into any Doom and replace Doom Marine/Doom Slayer.]
Essence of the Brain
[*By taking this essence, you unlock the energy of all your brain cells working together.
*Infinite memory and genius level intellect.
*You can manipulate Psionic energy in order to affect the world, the minds/perceptions of others or enhance your own body, all to massive levels.
*You can easily read the mind of anyone you choose, allowing you to easily and subtly manipulate them.
*You can program your power to do particular tasks ahead of time, so that you don't need to focus on them.
*You can sense any and all forces/energy, including time and space, allowing you to control them with enough effort.
*You gain Astral Projection/remote viewing, which allows you to observe distant events or enter the dreams of others.
You keep your other powers while in this state, allowing you to exert your abilities from an even greater distance.]
Essence of the Shape
[*By taking this essence, your form has become a suggestion, rather than something rigidly defined.
*You no longer have a default form.
Everything about you can be changed by your whim.
*You can shapeshift into forms that have greater or less mass than you, including inanimate objects.
*You can split off pieces of yourself and shapeshift those.
*You can transform into any being and gain their powers, along with combine multiple beings.
*You may transmute any matter, energy or living being around you into anything.]
Essence of the Breeder
[*By taking this essence, you become the sexiest thing alive.
*Your body is changed to become your ultimate ideal of sex appeal, including tremendous endowment.
*Porn physics apply to you.
*Members of the opposite sex are inexorably drawn to you.
You may toggle this on or off or set it to target certain criteria.
*Your charisma increases to ridiculous levels.
*You are guaranteed to impregnate or be impregnated every time you have sex, with however many or few babies you want.
This can be toggled on and off.
*Pregnancies last up to a third as fast as normal, and your offspring reach sexual maturity in a matter of months.
*There are no negative consequences for incest.
*Your offspring (which can be any sex you wish) can inherit your abilities, either at full power or weaker.
*You can breed with any species, and the offspring will either be a half-breed (with just the right amount of fusion) or purely one of the parent's species.
You choose which.]
Essence of the Blank
[*By taking this essence, you gain but one benefit: *Your potential becomes limitless.
You can learn any discipline or skillset, even if you shouldn't be capable of it, without forgetting it and practice them into mastery, no matter how many you learn.
Any abilities you have from other Essences will increase where possible and develop in ways beyond their initial purposes.]
Essence of the Merchant
[*You are able to assess the value of anything you see.
Any object, living being or even a concept such as a person's emotions.
This value can be equated to any other kind of value, whether it be physical currency, energy, mana, etc.
*By paying the value, you can gain ownership over that thing, or cause an effect, such as spending mana to cast a spell.
*You can sense, get in contact with and appear to or summon any entity you would like to bargain with.
*You can negotiate any sort of transaction with ease, with knowledge of loopholes and clauses.
*You can establish contracts for favors with other living beings in order to waive or reduce the value paid for the desired effect.
This can include supernatural beings such as demons.
*You may also act as a mediator between two parties, creating similar contracts and overseeing their execution impartially.
*Once a contract is signed and sealed, you are linked to the other party or parties and will know when they are fulfilling their end of the bargain.
This link lasts until the contract is fulfilled or all sides agree to break it off (should you include such a capability in the contract).]
Essence of the Ultimate Intellect
[By consuming this essence, the ultimate proof of the power of pure intellect, you transcend all known limits of intelligence.
*Your intellectual faculties (mental capacity, mental focus, calculation, computation, cognition, competence, memory, wit, ingenuity, creativity, mental perception, learning capacity, deductive reasoning, inductive reasoning, visualization, analysis, instinct, intuition, self-awareness, composure, mentality, multi-tasking, etc.) are increased to the absolute maximum possible in all existence, and perhaps slightly beyond even that.
*Your intellect is not only exponential but also transcendent and flawless.
The only possible cause for your making a mental error would be the garbage-in-garbage-out principle, because your cognition is perfect within the limits of the data available.
Even a supermassive quantum-computing Matrioshka Brain would be less than a protozoa compared to you.
Your processing capacity also scales up without limit, when necessary, to the point you could effortlessly solve any finite algorithm in a single unit of Planck time.
*You no longer have a subconscious; your intellect being enhanced to the point that you have a "supra-conscious" mind instead.
Like a subconscious your supra-conscious is capable of performing both mental and neuro-physical actions as background tasks without needing you to actually focus on them (although your heightened focus and multi-tasking could let you simultaneously concentrate on any number of separate things if need be), but unlike a subconscious you may have your supra-consciousness execute almost any task or tasks that your conscious mind would be capable of, however complex, and have your conscious mind exert total control over its functions when necessary.
*Your supra-consciousness also gives you instantaneous and effortless access to every iota of every quality and characteristic that you possess, and every scrap of knowledge that you ever have acquired or ever will acquire.
This grants you, among other things, a perfect memory with unlimited storage that is retroactive across your entire life to date to a degree bordering on postcognition.
*Your supra-consciousness also allows you to fully comprehend and control your emotional state.
While you still have a normal capacity for emotion should you so choose, you never become emotionally compromised or traumatized by anything unless you allow it.
Furthermore, your mind is capable of processing, resolving, and overcoming trauma with almost instantaneous speed when you focus on doing so, and will also autonomously use this self-repair capacity to return you to at least adequate mental functioning should your mind somehow be too catastrophically damaged to focus.
*Your intellectual expansion will not materially alter your personality against your will, although you may of course apply your newly heightened capacities for self-awareness and introspection towards the goal of personal growth and change if you want to.
Otherwise, you will still remain "yourself" as much as possible despite your new level of sentience, without risking the death of personality that can sometimes accompany transcendence.
*On the principle of a 'sound mind in a sound body', this essence grants you perfect health and average fitness for a member of your species.
The heightened capacity for conscious biofeedback that your supra-consciousness provides allows you to, among other things, maintain your level of physical fitness without deliberate exercise.]