Guide:Taming

Overview
 Use the "Taming crystal" (unlimited uses, pressing the hotkey will shoot a small blue projectile) on a creature you want to tame, a blue aura will surround the creature. Kill said creature in the Over-world using spirit arrows with whatever weapon you prefer. Open a portal to the Spirit Realm using a "Potion of the Other side". Find the spirit of the creature you’re taming; it should be right around where it was killed, it appears as a blue apparition. Have yourself or one person shoot it with the "Spirit Siphon" while you (or whoever is the intended owner of the tamed creature) shoot the creature using a bow loaded with Spirit Arrows and insure to NOT hit its vulnerable spot, as this will kill the creature before you can complete the taming. Once the blue taming bar that appears when you start hitting the creature with spirit arrows is filled you’ll see a big message appear saying that taming was successful Quickly exit the spirit realm as the portal only lasts 1 minute(s). Move near the Spirit Stables and press ‘o’ to open the pet interface. Click on the icon for your new creature and click the large ‘Set Active’ button. Press ‘z’ to pull out your creature and ‘z’ to mount it when possible. 

In-depth
First we’ll cover the basic tools you need to get started on taming: a Taming Crystal, a Bow, Spirit Arrows and a Siphon. The only rare resource you’ll need for this is Sunstone Topaz. Everything else you either already most likely know how to get or you can ask an ally.

The first thing you need to do is get some spirit residue together so let’s briefly cover that: We now need to acquire some Sunstone Topaz. You can either harvest Topaz nodes which look like small crystalline rocks that are yellow or you can hit regular rocks with a chance to get Topaz geodes. From there you can harvest the geodes to get one of the three types of Topaz: Topaz Shards, regular Topaz and Sunstone Topaz, with the latter being rare relative to the other two. There are many gem types in Rend beyond Topaz such as Quartz and Chalcedony each with 3 type: shards, regular and a rare type such as Sunstone.
 * To get spirit residue, you first need to get some spirits (the bar in the lower-left of your UI to the upper-left of your orange, energy bar) and then deposit them with the action key (default ‘f’) in the divinity stone (aka tree) at the center of your faction’s base.
 * To get spirits to deposit, you can either hit spirits that appear in the form of bluish wisps at night-time or you can harvest plants with a chance to get what are called spirit flowers. You can then eat these flowers to add varying amounts of spirits to your bar depending on the tier of the plants it came from.

Once you have some Sunstone Topaz you can make a Taming Crystal. This is utilized in order to banish a creature’s soul to the spirit realm.

To make one, go over to your faction’s Spirit Stables building with your Sunstone and the other ingredients. You will also utilize the Spirit Stables to make the Spirit Arrows required to tame the creature. After that, if you have a friend with you, you may want to make a Spirit Siphon so they can use that to amplify the amount of taming progress you do when firing spirit arrows at the creature.

Now you just need to get someone who can open a portal or, failing that, find a random portal (many spawn in every region of the world) out in the wilds, kill a creature near said portal and then you can go in. This is really dangerous if you don’t have a way to get out as they close just like the portal a Shaman opens and there’s no way to see how much longer it will remain open.

Once you have your tamed creature, go back to base, stand near the Spirit Stables and press ‘o’ to open the pet interface and press the big “Set Active” button to select your new tame and then press ‘z’ to summon it and ‘z’ again to mount it.