Elden Ring PC | Mad Pumpkin Head solo on NG

Defeating this boss unlocks access to Sorceress Sellen in the room behind him as well as the Waypoint Ruins Cellar site of grace.

Drops:
1100 runes & nothing else (no items, no achievements)

Mad Pumpkin Head
"Mad Pumpkin Head is a Field Boss in Elden Ring. These towering humanoids wield massive weapons and wear distinctive pumpkin-shaped helmets. These are optional bosses as players are not required to defeat them to advance in Elden Ring."
https://eldenring.wiki.fextralife.com/Mad+Pumpkin+Head

Sorceress Sellen
"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."
https://eldenring.wiki.fextralife.com/Sorceress+Sellen

This is technically a boss, so adding it to the boss defeat series. There are so many Elden Ring bosses like this. There are non-boss NPCs that are harder than a boss like this. Despite that, in my first attempt, I forgot the strategy since the last time I played and had just one flask of Crimson Tears and ended up dying.