The blade ladder

A Locksmith's Secret [Knock 2]: "Sooner or later, every locksmith has the Dream. Now we recite its seven phases... [Nearly every summoning rite requires Knock influence. This lore will provide it.]"

An Iguvine Rite [Knock 4]: "Every door in the Mansus requires its sacrifice before it will open. The Iguvine Rites prescribe the manner of the sacrifice. [Nearly every summoning rite requires Knock influence. This lore will provide it.]"