I'm making a custom race on D&D beyond and want to follow what the Loxodons have for their natural armor using CON as their modifier: 

You have thick, leathery skin. When you aren’t wearing armor, your AC is 12 + your Constitution modifier. You can use your natural armor to determine your AC if the armor you wear would leave you with a lower AC. A shield’s benefits apply as normal while you use your natural armor.

Does anyone know what I'd have to do with modifiers on D&D Beyond to make this homebrew work? 

Many thanks, Luke 

This requires two modifiers. 

First, Modifier: Set -> Submodifier: Unarmored Armor Class -> Primary Stat: Con -> Fixed Value: 2.

Now the Unarmored AC is equal to 12+con+dex. So, we add another modifier.

 Modifier: Ignore -> Submodifier: Unarmored Dex AC Bonus.

Hope that helps!

That is great! Thanks so much. I was so close but just couldn't work out the rest.

Thanks for your help.

Luke

I tried the same thing but when putting it into action it still does not work... do I have to give it time?

Yes, it can take up to 20 minutes for changes to push through to the character sheet. However the system only picks up those changes when the main save button for the homebrew is hit.

Yes! The next day it worked properly! thank you!

Does the same process work for Lizardfolk Natural Armour?

Quote from Jeremy_Nicol >>

Does the same process work for Lizardfolk Natural Armour?

 Even simpler:

Modifier: Set->Subtype: Unarmored Armor Class->Fixed Value: 3

It worked great! Thank you :)

Do take note also, so not to confuse yourself later. RAW kicks in automatically within the system if the AC of armor is lower than natural AC, same as it does for a Monk's Unarmored Defense. Basically because you are using the natural AC, your classed as unarmored even if you have say leather armor on, though wearing armor will automatically affect Unarmored Movement. Monk's abilities, and magic items, state they cant be used with armor, however since you are using your natural armor, or in a monks case no armor with Unarmored Defense pushing your AC higher than the armor you decided to wear, your seen as wearing no armor when it comes to such things as Braces of Defense because of that option of the character choosing to use their natural armor instead of the armor they are wearing, which as it being natural, your got not much choice unless someone skins you lol

Just thought I would add that so you dont get confused later when tossing on some armor which is equal to or lower than the natural AC, and have Braces of Defense on and it still shows such working.

I would like to think you as I was also having this exact same problem and it was just infuriating trying to make it work

How to make it so the natural armor does not get affected by the monk unarmed ac?

Quote from Krossofages >>

How to make it so the natural armor does not get affected by the monk unarmed ac?

 
It should be automatic if you set up the natural armor properly.

So it is still taking the wisdom mod from the monk and adding it, how would I fix this problem?

Quote from Krossofages >>

So it is still taking the wisdom mod from the monk and adding it, how would I fix this problem?

 
What exactly is it supposed to do? Is it like the lizardfolk’s natural armor where it’s 13+Dex, or is it supposed to be something different? You gotta tell me so I can help.

It is exactly like that but instead of dex is using con and dex like the monk unarmored defense but replace the wisdom with con 

So which is it, exactly like that, or using Con? I’m confused, please select from one of the following choices:

1. Your armor class is equal to 13 + your Dexterity modifier when not wearing armor. (Just like Lizardfolk)
2. Your armor class is equal to 13 + your Constitution modifier when not wearing armor. (Unique)
3. Your armor class is equal to 10 + your Dexterity modifier + your Constitution modifier when not wearing armor. (Just like Barbarian)
4. Your armor class is equal to 13 + your Dexterity modifier + your Constitution modifier when not wearing armor. (Unlike anything because it’s so OP)
5. None of the above. (😐🤔🤯😵‍💫🤪)

its supposed to be number 2

To set the base AC to 13:

• Modifier: Set→Subtype: Unarmored Armor Class→Fixed Value: 3

To add Constitution to the calculation, use the following Modifier:

• Modifier: Bonus→Subtype: Unarmored Armor Class→Ability Score: Con

To remove Dexterity from the calculation, use the following Modifier:

• Modifier: Ignore→Subtype: Unarmored Dex AC Bonus

Awesome thank you so much!