New:

New nice animation when taming the warden, also now it regenerates all the remaining life when tamed.

now when walking you will notice particles if you have the depth dominion key.

Abyssal Bench:This is a new crafting table in which you can craft the items included in this addon, you can only get them in the chests of the structures included in the addon.

Depth Dominion Key: With this item you can tame wardens, just click on a warden with it and it will become your pet.

Its crafting is done on the abyssal bench, sculk fragments, diamonds and a bottled warden essence are required.

Bottled Warden Essence: It is used to create the "depth dominion key" in the abyssal bench.

This item is obtained from the warden, when you kill a warden he will drop one.

Sculk Fragment: You will need it to craft items in the abyssal bench.

This new item is only available in the chests of the structures added by the add-on.

Food for the Warden: It will serve to recover the life of your warden.

They are created in the abyssal bench and their crafting is as follows.

Warden: As the guardian has become your pet, it will follow you wherever you go, it will defend you from hostile mobs among other things that you will have to see for yourself while testing the add-on, but I will mention some of them, as the following:

Ride: You will be able to ride on top of the warden, thanks to this you will be able to move much faster through your world.

Inventory: The warden has his own inventory, you can store your things there.

Sit: You can sit him down, in case you don't want him to follow you.

video in Spanish talking about the add-on update 0.7:

Video in which I explain the add-on in English and Spanish (Español) language:

Remember to activate the experimental functions and download and install both the behavior and the resource pack of the add-on, I hope you like it. 

(Now it is not necessary to activate “Holiday Creator Features” so that it can be used in 1.21.20+.)