Hi, huge heads up for the most important ore in the game.
Allthemodium armor is simply not working.
Despite boasting ridiculously high defense, enemies are able to easily damage you. It's no different than diamond armor.
Vex eat right through it and the Illager damage is exactly the same. I hadn't enchanted this armor or anything. I don't need to with what's supposed to be overpowered stats.

Thanks!

Damage reduction from Armor and Armor Toughness alone is capped at 80% total, no matter how much Armor and Armor Toughness you have. With the vanilla formulas, this means even if your unenchanted armor provided infinite Armor and infinite Armor Toughness, you would still take 2 HP (one heart) of damage for every 10 HP of regular damage received.

The Protection enchantment is required to decrease damage taken further as its damage reduction stacks multiplicatively with that from armor and armor toughness, for a total damage reduction potential of 96% (0.4 damage taken per 10 damage received)

See also Darkhax-Minecraft/AttributeFix#16

Vanilla mechanics