The Blood altar teleport is a type of Magic tablet which allows you to teleport directly outside the Blood altar.
It is purchasable by exchanging 45 Runecrafting guild tokens earned through the minigame The Great Orb Project with Wizard Elriss. However, to obtain these tablets, an indirect requirement of level 50 Runecrafting is required to enter the Runecrafting Guild and be able to play The Great Orb Project to purchase them.
It can only be used by players who have completed Legacy of Seergaze, otherwise you will receive a message saying "A strange power blocks your teleport."
These are useful for players training Slayer, as the teleport is not far from Mutated bloodveld.
With the release of the Morytania Task set, if a player is wearing the Morytania legs 3, it will have a 50% chance of not breaking.