Serpentine Pants Ability is as follows:
Gain 6% (Rare) | 8% (Epic) | 10% (Legendary) | 12% (Mythic) of your Starting Armor when you cast a green spell.
However, after confirmed testing the values instead appear to be as follows:
4% (Rare-confirmed) | 6% (Epic-Confirmed) | 8% (Legendary-Confirmed) | 10% (Mythic-Assumed) of your Starting Armor when you cast a green spell.
Unsure as to whether the “bug” is the ability itself (underperforming the text) or the text (overstating the actual intended benefit)