Elden Ring PC | Defeating Mad Tongue Alberich in Roundtable Hold on NG

You can start the fight every time by backstabbing him first thing when he spawns, like I do here.

Drops:
1,562 runes
Taunter's Tongue

Mad Tongue Alberich
"Mad Tongue Alberich is an Invader in Elden Ring. He was one of the first Tarnished to stay at the Roundtable Hold, and is said to be a heretical sorcerer. He uses the Scythe and the Staff of the Guilty."
https://eldenring.wiki.fextralife.com/Mad+Tongue+Alberich

Taunter's Tongue
"Taunter's Tongue is a Multiplayer Item in Elden Ring. Multiplayer Items allow players to interact with each other in various ways, including leaving messages for other players to read, co-operative gameplay and competitive gameplay like PVP."
https://eldenring.wiki.fextralife.com/Taunter's+Tongue