Sorceress Sellen is a Merchant and NPC in Elden Ring. She can be found inside the Waypoint Ruins, far east from where you first arrive in Limgrave. She can teach you Sorceries. She can also be made
available as an NPC Summon for specific battles.


 You can choose among the following options while talking to Sorceress Sellen:

Study sorcery: Learn a sorcery from Sellen in exchange for Runes.
Give a scroll: Give Sellen a sorcery scroll key item to add the sorceries contained within it to Sellen's merchant inventory.
Give letter of introduction: After receiving the Letter of Introduction from Preceptor Seluvis, you can then speak with Sellen about it. She will inform you that General Radahn must be defeated in order to restore the movement of the stars, which will reveal a way to access the lost city of Nokron.