Talk:Rabadon's Deathcap/@comment-26034614-20150419011511/@comment-30641829-20161214115507

The amount of steps towards the final items decides what kind of category the item falls in.

Both items you mentioned are build out of basic items, and thus it's counted as an advanced item.

BT builds out of a vampiric scepter (an advanced item, since it builds out of a long sword), and is thus a legendary item.

BotRK for example is even higher (Mythical), because it builds out of a legendary item (cutlass), which builds out of an advanced item (vampiric scepter), which again builds out of a basic item (long sword).