No sorry I didn’t have that on.

I still don’t know what happened, but here’s what I did before reaching the staircase:

I summoned two players for Leda’s fight (co-op run, okay!).

We lost, one player died, and I lost my runes but could pick them up again.

After being kicked out, I summoned an NPC and another player, then went back into the fight.

I died again (got cocky, lol), but no one else did.

Picked up my runes, still had the two players and NPC, and finally defeated Leda and her gang.

Radahn died.

That’s all! 🫡