Rare Stone Talus Heart
A Rare Stone Talus Heart is an enemy drop in Tears of the Kingdom.
Tears of the Kingdom
They are spiked rocks in the shape of a 🖤, which cannot be further broken down or taken into Link's inventory. They can, however, be fused to a weapon; adding a fuse power of 33 and creating a fused weapon which is always called a Rare Stone Talus Hammer (if a one-handed or two-handed weapon) or Rare Stone Talus Sledge (if a spear) regardless of the original weapon name.
Fuse showing the Rare Stone Talus Heart name