Hydra

Hydras are level 80 Summoning familiars, and these familiars are known to have dual heads. Hydras can be used for Ranged training, as their skill focus in Ranged. These familiars are also helpful during Farming, as they have the ability to instantly regrow trees from Farming tree stumps.

Pouch
Hydra pouch is made by using a Summoning pouch on a Summoning obelisk with 128 spirit shards, a Green charm and a water orb in the inventory. Making the pouch earns 140.8 experience points. Using the pouch to summon a Hydra gains 1.6 experience points, and costs 9 Summoning points.

Scroll
Regrowth scroll enables the use of the Regrowth special move for a Hydra. Using the pouch on a Summoning obelisk creates 10 scrolls.

Special move: Regrowth
Regrowth is a special move for Hydras. When used on a farming tree stump, it automatically regrows the associated tree without delay. Note that it can only be used on trees grown using the Farming skill. Regrowth is really helpful when cutting Magic Trees that you have farmed.