On Lioden, if you take a look at any lion, you will notice a line in their Appearance section that is called Genetics.
Let's take a look at my king, König.

As you can see, König's genetics are Black Dark Solid Rare.
We'll take a moment to dissect this and explain each piece—basically, read it as Colour Shade Gradient Rarity.

Colour Groups  

There are four different colour groups: Black, Cream, Golden, and Red.
All bases on the site fall into one of these colour groups.

If you were to cross two parents from the Black colour group, all of their subsequent offspring will have bases from the Black colour group. If you cross a Black colour group parent with a Cream colour group parent, you can end up with offspring from both the Black and Cream colour groups.

For breeding, you will want to do your best to match colour groups together. This way, you have higher odds of producing the base you're looking for, whereas breeding in different colour groups can result in many different potential outcomes.

Shades  

There are three different shades: Dark, Medium, and Light.
This is where the bases start to split up a bit more into their own categories.

Now, let's say you want to get a little bit more detailed with your breeding. You don't want just any Black colour group cub. You want one specifically with Black Dark genetics. Your best option would be to cross two parents with Black Dark genetics, such as Onyx or Slate.

The way that shades work is like so.

Dark x Dark = Dark
Light x Light = Light
Dark x Light = 25% Dark, 25% Light, 50% Medium
Medium x Medium = 15% Dark, 15% Light, 70% Medium
Dark x Medium = 50% Dark, 50% Medium
Light x Medium = 50% Light, 50% Medium

If you breed two Black Dark genetics together, you are guaranteed a Black Dark cub; the same can be said for Black Light. However, as you can see, breeding two different shades together has a chance of giving almost any shade, especially if you were to breed a Black Dark and a Black Light together. You could potentially receive offspring with almost any Black genetics base, though this does depend on the parents' bases themselves.

Gradients  

There are two different gradients: Countershaded and Solid.
Most bases are easily recognisable as to whether they are Countershaded or Solid.

Countershaded bases are bases that have more than one colour in its makeup. They can include bases that have a dark topline and a light underside, or a light topline and a dark underside.

Solid bases are bases that are completely or nearly the same colour throughout the entire base. Don't be fooled, though! Solid bases can have different colours, and even some shading details. They're just more "solid" all throughout.

Breeding with gradients is a bit simpler than shades.

Countershaded x Countershaded = Countershaded
Solid x Solid = Solid
Countershaded x Solid = 50% Countershaded, 50% Solid

What the above means is that if you cross two Countershaded parents, all offspring will be Countershaded. If you cross two Solid parents, all offspring will be Solid. If you cross a Countershaded with a Solid, you can have cubs from either gradient!

Rarity  

Finally, there are four different rarities: Common, Uncommon, Rare, and Special.

Common bases are mostly made up of bases that can be found in explore on NCLs as well as rolled males. Most Oasis-applicable bases are classified as Commons, as well as certain combo bases.
Uncommon bases are certain bases that can only be applied via customising and the Oasis.
Rare bases are bases that can only be achieved through breeding with Uncommon, Rare, and Special bases.
Special bases are the most difficult-to-breed bases on Lioden. These include event applicator bases, non-common combo bases, NCL-exclusive bases, and raffle-exclusive bases.

Rarities are passed much differently when compared to colour groups, shades, and gradients. Below, we have included a guide to indicate your relative chances when breeding different rarities together.

The Uncommon and Rare rarity categories have the exact same pass rate as each other. The only difference between an Uncommon base and a Rare base is that one can be applied via customising and the Oasis, while the other can only be bred for.

Special bases will never pass unless one of the parents is that specific Special base. Your highest odds of producing a Special base would be to breed together two Special rarity lions.

To give an example of breeding between different rarities, let's preview the possible outcomes between a few different bases.

As you can see, breeding a Black Dark Countershaded Common parent to a Black Dark Countershaded Rare parent can potentially produce cubs with Black Dark Countershaded Common, Uncommon, and Rare bases.
However, breeding a Black Dark Countershaded Common parent to a Black Dark Countershaded Special parent, while they can produce Black Dark Countershaded Common, Uncommon, and Rare bases, can only potentially produce that specific Special base that one parent has (in the example above, Celestial).

Breeding two different Black Dark Countershaded Special parents together can potentially produce any Black Dark Countershaded Common, Uncommon, and Rare bases, as well as having a chance of producing either Black Dark Countershaded Special bases from the parents (in the example above, Celestial and Divine).

TL;DR: A Celestial will not pop up when breeding two Slates together; however a Slate can pop up when breeding two Celestials together!

Before we begin, here is an example headshot icon of a base on Lioden.

All headshot icons will have a letter in a coloured box in the upper lefthand corner of the icon, as well as a yellowed rectangle in the lower lefthand corner.
The coloured icon indicates whether the base is a Common (grey C), Uncommon (green U), Rare (blue R), or Special (purple S) rarity base.
The yellowed rectangle indicates whether the base is Applicator (applied via event applicators), Breed Only (only achieved through breeding), Combo (only achieved through breeding specific bases), Custom (applied via Oasis), Exclusive (found on specific NCLs), or NCL (found on common NCLs and rolled males).

From the above example using the Ebony headshot icon, one is able to see that it is a Rare, Breed Only base. Keep the above example and key in mind when perusing the headshot icons listed below.

Now, let's go to what you probably came here for: a peek at all currently-existing bases on Lioden! They will be broken up into different sections based upon their colour and gradient.

Black Countershaded  

Dark
Black Dikela Gray Pewter Vandal Korat Slate Augur Celestial Divine Elysian Ice Penumbra
Medium
Cloudburst Dun Steele Sterling Maltese Cocoa Arctic Aufeis Hematite Leonid Moonstone Murk Sidereal
Light
Dove Gray Dusty Rosy Brown Silver Gray Chartreux Glacial Opal Pulsar Skyward Snowflake Soul

Black Solid  

Dark
Chestnut Jet Nadir Obsidian Titanium Onyx Ebony Noctis Haze Interstellar Nuummite Spectre Velvet
Medium
Dark Brown Liver Silver Flint Demiurge Duat Frostbitten Lilac Rhino
Light
Albino Birch Eggshell Isabel White Clear White Ashen Cairngorm Glass

Cream Countershaded  

Dark
Blonde Dusty Rose Pecan Savannah Russet Arabica Moss Agate Nacre Olive Supernal
Medium
Dark Vanilla Deep Fawn Hazelnut Mongoose Cameo Ammonite Asiatic Fossil Guardian Hallowed
Light
Almond Antler Vanilla Buff Cherry Blossom Ethereal Ivory Nautilus

Cream Solid  

Dark
Caramel Khaki Persimmon Tan Amber Hellebore Parhelion Qahir
Medium
Camel Cream Cream Darker Dark Fawn Fawn Buttercream Heavenly Pearl Ruffian Sphinx
Light
Apricot Beige Cream Lighter Light Cream Buttermilk Teardrop Alabaster Solaris

Golden Countershaded  

Dark
Deira Doubloon Jacinthe Ochre Dinar Fulvous Anubis Asali Ember Hyena Kimanjano
Medium
Ducat Oatmeal Saffron Sunflower Nacarat Bast Dhahabi Mandarin Maziwa Sunspot
Light
Bisquit Bone Sunglow Wheaten Champagne Angelic Citrine Maat Nudar

Golden Solid  

Dark
Dark Golden Zarafshan Zarbanu Xanthic Udara Chatoyant Ornament Trophy
Medium
Luteo Sundust Zarasa Zarin Topaz Goldenrod Gilded Green Labradorite Mobola Sahara Victor
Light
Bisque Lemon Light Golden Linen Zer Zivar Sunshine Sulphur Festive

Red Countershaded  

Dark
Auburn Brass Bronze Mulberry Ruddy Prune Demonic Madagascar Rhodonite Rough Ruby Temporal Unholy
Medium
Ginger Mauve Rust Rhubarb Anjeer Brimstone Chaos Hibiscus Inferno Scoundrel Sunset Wine
Light
Copper Palomino Sorrel Tawny Fiery Maroon Blazing Fuchsia Sunrise

Red Solid  

Dark
Chocolate Henna Redwood Shedua Black Rose Bloodbourne Manakbir Merlot Sha
Medium
Brown Locust Mahogany Sienna Umber Blush Rose Rose Gold Sepia Seth
Light
Cedar Cremello Fallow Sandy Wild Rose Cinnabar Sapela Ardor Orchid