Elden Ring | Rennala, Queen of the Full Moon boss fight co-op w/1 summoned player, NG w/achievement

Drops:
36,000 runes
Remembrance of the Full Moon Queen
Great Rune of the Unborn
Rennala, Queen of the Full Moon achievement (Steam / PC)

Rennala, Queen of the Full Moon
"Rennala, Queen of the Full Moon is a Legend Boss in Elden Ring. Though not a demigod, Rennala is one of the shardbearers who resides in the Academy of Raya Lucaria. Rennala is a powerful sorceress, head of the Carian Royal family, and erstwhile leader of the Academy. Rennala is an optional boss, and doesn't need to be defeated in order to advance in Elden Ring. However, she is a shardbearer, and two of the five available shardbearers must be defeated before entering Leyndell, Royal Capital. In addition, she must be defeated to achieve a certain ending."
https://eldenring.wiki.fextralife.com/Rennala+Queen+of+the+Full+Moon

Remembrance of the Full Moon Queen
"Remembrance of the Full Moon Queen is a Consumable Item in Elden Ring. Most Consumables grant various effects such as restorative properties for recovering HP, removing certain negative status effects or applying temporary buffs and debuffs, while others can be thrown at enemies to deal damage."
https://eldenring.wiki.fextralife.com/Remembrance+of+the+Full+Moon+Queen

Great Rune of the Unborn
"Great Rune of the Unborn is a Great Rune in Elden Ring. Great Rune of the Unborn provides the perfect rebirth ability. Great Runes in Elden Ring are special items dropped by Demigod Bosses that can be equipped to acquire special passive bonuses."
https://eldenring.wiki.fextralife.com/Great+Rune+of+the+Unborn

Rennala, Queen of the Full Moon achievement
https://www.trueachievements.com/a354500/rennala-queen-of-the-full-moon-achievement