Ancient Summoning is an expansion to the Summoning skill that can be unlocked at level 68 Archaeology (boostable).
In order to unlock making Ancient Summoning contracts/pouches, the mystery Dagon Bye must be completed and players must sign a pact with Dagon. Once the pact is signed, players may create binding contracts by combining a blue charm, a normal pouch, two Blood of Orcus, two hellfire metal, and 200 spirit shards at a summoning obelisk. Nevertheless, it is not required to complete the mystery to summon Ancient Summoning familiars.
Players can bind a monster by killing it with a binding contract in their inventory. When the monster is killed, the player will send it to the contract, creating the pouch itself. An inventory space must be available for this to occur; otherwise, the pouch will not be made at all. Each monster has its own summoning and slayer level requirement to bind it, whereby the slayer requirement is always equal to the summoning level needed to summon the pouch[1]. Making the scrolls requires the player to visit a summoning obelisk.
Players get Summoning experience by using the familiar, not by making it. These Summoning creatures have special effects akin to the Slayer creatures that were killed to make it.
Grants a 5% chance while training Mining, Fishing, Woodcutting, Divination, or Archaeology to duplicate the gained resource and store it within itself. Can carry up to 20 items.
Teleports all items stored within the familiar's inventory to your bank.
^Mod Sponge. Need Help! creating kalgerion demon pouches does not work. Reddit. 11 August 2020. (Archived from the original on 21 January 2023.) Mod Sponge: "so this is actually part of how binding contracts work - each familiar also has a slayer requirement to catch them, that is equal to their summoning requirement."