Elden Ring PC | Fallingstar Beast boss fight co-op w/1 summoned player on NG

I was having problems with this boss and so I asked a friend to help. I feel bad that he died. Please don't yell at me. ¯\_(ツ)_/¯

Drops:
5,700 runes
1x Somber Smithing Stone (6)
5x Smithing Stone (5)
10x Gravity Stone Chunk
1x Somberstone Miner's Bell Bearing

Fallingstar Beast
"Fallingstar Beast is a Field Boss in Elden Ring. This a massive quadruped is covered in crystals and is found in multiple locations. This is an optional boss as players are not required to defeat it to advance in Elden Ring, but doing so will yield useful items and Runes."
https://eldenring.wiki.fextralife.com/Fallingstar+Beast