Elden Ring PC | Dragon Communion Seal location from Stranded Graveyard site of grace

The Stranded Graveyard site of grace is the very first site of grace encountered in the game, immediately after the optional tutorial. Next to it, there is a fog wall that blocks access to another optional area that you can unlock with a Stonesword Key. A Stonesword Key is an optional starting gift when you roll a new character, but I recommend choosing a Golden Seed instead as a starting gift. You can always come back to this area later in the game, like I do here.

There are basically two general places you can get to. One is the Ulcerated Tree Spirit boss that drops 15,000 runes (on NG), one Golden Seed, and one Banished Knight Oleg (Spirit Ashes). Another reachable area will get you to a room with a Banished Knight. When you defeat that knight, it will drop a Dragon Communion Seal, a weapon that allows its use to cast Dragon Communion Incantations. The other item to loot here is 1x Dragonwound Grease, an item that coats your right-hand armament to increase damage against dragons.

Dragon Communion Seal
"Dragon Communion Seal is a Sacred Seal in Elden Ring. It is instrumental in the practice of Dragon Communion. The Dragon Communion Seal scales primarily with Faith and Arcane, and is a good Weapon for casters that focus on Dragon Communion Incantations."
https://eldenring.wiki.fextralife.com/Dragon+Communion+Seal

Dragon Communion
"Dragon Communion is a seldom-known practice in Elden Ring. It involves feasting on the remains of Dragons in order to gain their powers and features. Dragon Hearts are required in order to be exchanged for Dragon Communion Incantations at select locations in the game. After obtaining 4 spells in this manner, the tarnished's eyes will turn draconic, which can be undone at Fia's Mirror in Roundtable Hold. The enemies that drop Dragon Hearts include named dragons, Glintstone Dragons, Magma Wyrms (including Makar and Theodorix), Ghostflame Dragons and Jagged Peak Drakes."
https://eldenring.wiki.fextralife.com/Dragon+Communion

Dragon Communion Incantations
"Dragon Communion Incantations are a group of Incantations in Elden Ring that share a crest, characteristics, or a specific type of buff criteria. Dragon Communion Incantations revolve around using draconic powers and breath attacks to deal damage. Dragon Communion is seen as a dangerous practice."
https://eldenring.wiki.fextralife.com/Dragon+Communion+Incantations

Stonesword Key
"Stonesword Key is a Key Item and optional Keepsake in Elden Ring. Stonesword Key can be used to break one imp statue seal. Key Items in Elden Ring include a wide variety of items found in specific locations or are given by a related NPCs which are used to unlock areas, quests, and to further progress the game's story."
https://eldenring.wiki.fextralife.com/Stonesword+Key

Ulcerated Tree Spirit boss fight solo on NG
https://youtu.be/kBnMvTVG_yo