>>281967890
I think it's Joyboy's holy sword stuck in stone, named Day. But the sword couldn't be removed because the stone of god valley is nigh invincible short of the legendary holy sword and even Garling couldn't pull it out. However a young boy with the same eyes as Imu can pull the sword and eventually he uses his haki to turn it black and renames it to Night, or "Yoru" as a young teen. The boy's special eyes and ability to pull the holy sword from the stone attracted Garling's attention and he wants to raise him as a God Knight.