Essence of the Emperor of Mankind
By drinking this Essence you gain the following boons
A one-time full body Resculpt, you may also be female with this if you wish
You are now a perpetual, an immortal human, your healing is elevated to the point where you can regenerate from a single atom within a minute and can regrow lost limbs in an instant. Unlike normal Perpetuals, you are a true immortal there is nothing that can kill you even soul death, for your immortality is not skin deep but extends to your soul.
You receive the combined knowledge of every Perpetual, this includes the God Emperor of course
Perfect Memory with infinite Knowledge
Beyond Genius Level Intellect
Beyond human level processing speed
Immunity to Insanity and Memetic hazards
An unbreakable will capable of taking on the full brunt of the 4 chaos gods and not cracking in the slightest, nothing will be able to shake you, however you will still keep hold of that which makes you human so though you can feel fear it will not make you waver.
Gain Infinite trains of thought and the ability to multitask
You gain immense psychic potential equal to the God Emperor of Mankind at his strongest
You are now the strongest Psyker to ever exist capable of utilizing every technique and ability shown by Psykers in canon, lore, tabletop or games
Your Powers are completely separate from the warp so you need not worry about the downsides and dangers of it when using them
You may induce Psychic potential in others, the more power you use in doing so the stronger the Psyker they will become. They will be completely loyal to you incapable or betraying you or even thinking badly of you
Your body is altered to reflect your new glorious state of existence. Your body gains all the upgrades that the Custodes and Astartes get but 100x as powerful and void of defects, Your body will naturally be well over 14ft tall though you will also gain the ability to shift your size at will allowing you to assume a more normal size before returning to your normal size.
You have absolute control over you power and body so you need not worry about putting to much power into your telepathy and accidentally turning someone into a vegetable or accidentally breaking a door handle as you grab it
You gain the ability to turn others into what are essentially Emperor made Daemons, granting them immense power and the ability to revive upon death, they will all be infallibly loyal to you. They are all immune to Corruption that is not yours
An immense charisma that allows you turn those with even the greatest and most unbreakable willpower's into your willing fanatical followers
You become a great judge of character able to pick a person apart and completely understand them with but a few second glance
All the skills needed to Successfully manage and rule a universe spanning empire
You gain a one time boon, of being able to instantly boost any 20 people you choose to Primarch levels, their abilities and traits up to you at the time of ascension, with no adverse effects towards your person. If you wish to create more Primarch level beings you will have to do it the normal way
You receive an archive containing the cumulative knowledge of humanity from the Horus heresy to the 41st millennium to even the Age of Technology. This archive is highly intuitive with a search engine that can read your wants and intent and either find you what you want or the closest thing
All warp based technology will work as if the warp exists even if it doesn't
Optionally you receive a planet on par with Holy Terra, it is already populated with obedient subjects who worship you as their God/Goddess, it will also come with the orbital defenses that Terra would
Optionally you receive the ability to gain power from worship, eventually you will gain so much that you can ascend into a true god. This also comes with the ability to bless your faithful with miracles, whether that be making the blind see, the infertile fertile or fixing fatal damage on a dying soldiers body. Those who worship you will also become incorruptible and impossible to convert from your religion
You Receive the star ship known as the Imperator Sominium it will come fully staffed and will come armed with completely loyal and incorruptible Adeptus Custodes, Guardsmen, Techpriests and Soroitas all of which are fully equipped, your ship will also come fully armed with all the war-gear and vehicles your soldiers will possibly need. The ship will never run out of fuel or munitions and can still use a form of completely safe warp travel even if it does not exist in your world. If any of your soldiers die they will reappear on the ship fully intact in 24 hours. If the Ship is destroyed you will be able to re summon it in 24 hours. If you are female your Custodes will be too
Optionally you may receive the Star Fortress known as the Phalanx it will come fully staffed and will come armed with completely loyal and incorruptible Adeptus Custodes, Guardsmen, Techpriests and Soroitas all of which are fully equipped, your ship will also come fully armed with all the war-gear and vehicles your soldiers will possibly need. The Fortress will never run out of fuel or munitions and can still use a form of completely safe warp travel even if it does not exist in your world. If any of your soldiers die they will reappear on the ship fully intact in 24 hours. If the Fortress is destroyed you will be able to re summon it in 24 hours. If you are female your Custodes will be too
You receive all of the Emperors gear including his armor and sword all of which are fitted to your new body
Should you happen to enter the Warhammer setting your powers and nature would interact with the Warp in the same way that the Emperor's does, including his ability to help create other psykers. In any other cosmology your powers are independent of the Warp which almost certainly doesn't exist there anyway, and it may or may not be possible for you to foster and unlock psyker potential in others depending on local conditions.
Finally, Your potential is limitless, your powers and abilities will continue to grow for all of eternity
Optionally, you may at any time choose to take a one way trip into the world of Warhammer 40K, or a variation of it. This can be any alternate universe, like a fanfic or one made perfectly for yourself. You can either simply be dropped in or reincarnated into the body of an existing character or someone new.