Revenant Strike, or Undead Blast (it is called Undead Blast due it is undead form of Iban Blast) is a spell that uses a prayer point and 1 blood and 2 death runes when casted, creating a skull attack that teleblocks a opponent and inflicts +50 damage + 100 for each blood rune and 50 for each death rune added. It needs a Magic level of 92. It is the most damaging spell and cannot be auto-cast.