The Rountable Hold in Elden Ring acts as a home base for the player. They can upgrade their gear, sell and buy items, and chat with other Tarnished about their adventures so far. Over the course of the game, there are about 14 different characters the player can meet at the Roundtable Hold.
There is a lot of lore behind these particular Elden Ring NPCs. Some of them ultimately betray the player, many die, and some even have personal quests that can impact which ending the player can get when they beat the final boss. Their stories are all vastly different, and some have lore very much tied to the history of the Lands Between.
Elden Ring is Out, So Now It's Hollow Knight: Silksong's Turn
Brother Corhyn is one of many characters that can teach incantations. His goal is not to become Elden Lord, like many other Tarnished, but to actually be the new Elden Lord's counsel. He wishes to council them in the proper ways of the Golden Order. According to him, the Golden Order bestowed him the duty of documentarian, and he is very dedicated to that role. He seeks out Goldmask, a scholar of great renown, to document his wisdom. However, Corhyn ends up believing more in the Golden Order than the Goldmask when both are at odds with each other.
Diallos of House Hoslow is a man first met at Roundtable Hold while looking for a missing servant of his house. He has an older brother that can be met at the Mountaintops of the Giants, a hostile NPC named Juno Hoslow. According to lore, Juno inherited the Hoslow legacy because Diallos was known to be weak. This instilled insecurity in Diallos (despite his older brother loving him) and that is why he is seduced into joining Volcano Manor for a time when he sees an opportunity to prove himself.
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