Essence of the Tarnished
*You gain the skills, abilities, and items of one of the classes offered in Elden Ring, whether that be the Hero, Prisoner or even the unfortunate Wretch. You may also take this as an opportunity to become one of the many variations of humans in Elden Ring or simply use it to tidy up your appearance.
*You are touched by the Grace of the Erdtree which for better or worse is something you are stuck with now. Not even the Greater Will can take away your Grace. Even if you weren't in the same reality as the Erdtree and the Golden Order you will maintain it's blessings. Death becomes little more than a stumbling block for you as you will simply rise again at a Site of Grace. You can also erect Stakes that will allow you to revive at them instead of a Site of Grace.
*You are able to see the guidance of Grace and can find Sites of Lost Grace even if they shouldn't be present. The Guidance of Grace will point you to the next Site of Grace that is closer to your objective if any. From these sites of Grace you can grow stronger by using Runes to strengthen yourself and otherwise utilize the sites of Grace as you'd expect. You do not require a Finger Maiden to strengthen yourself with Runes but you can still make use of one if you desire. You also gain a Flask of Crimson Tears, Flask of Cerulean Tears and Flask of Wondrous Physick. Optionally comes with a loyal Finger Maiden, you could even get Melina if you so felt like it.
*You seem to be able to find Runes anywhere you go though getting a lot of them might be more difficult if you have a lack of opponents to slay but you will sometimes be able to find things such as Golden Runes every now and then. Similarly you will be able to acquire other critical items and materials that a Tarnished might otherwise encounter in the Lands Between such as Remembrances from very strong foes, Spirit Ashes, Ashes of War, Sorceries, Incantations, etc. The notable exception are Great Runes which would require somehow reaching the Lands Between and tracking down their holders.
*Gain a Spectral Steed Whistle which can call forth something similar to Torrent, it can even be Torrent if you desire it. It is a loyal beast.
*Gain a Spirit Calling Bell and Spirit Ashes of your choice. You can make use of Spirit Ashes anywhere unlike normally.
*Optionally you can be sent to the Lands Between, even taking up the role of the protagonist Tarnished and awakening in the Chapel of Anticipation. Should you do so and become Elden Lord you gain full control over the Erdtree, the resulting Order, and Greater Will. Similarly you will gain full control over the Frenzied Flame should you instead become Lord of Chaos.