This spell is a cool idea! I'm always excited for alternative options to Mage Armor and Amor of Agathys. There are a few discrepancies in the spell however, and some notes I would make. First of all, the spell's duration says it lasts for eight hours, but the description says it lasts for only four. I feel like four hours would be the better choice as potentially the AC a creature gains is higher than what Mage Armor would give and that spell lasts eight hours. Additionally, I'm not quite sure what the battle points are you refer to in the description, but if the spell is made for a specific class or subclass it would likely function better as a (sub)class feature instead of a spell. Finally, I don't quite understand why the casting time is only a bonus action. One of the most interesting things about the armor spells to me is that you will have to predict when you will need it or waste a turn in combat if you were unprepared. This is a great skill game and punishment for casters to learn what dangers they may be in for on any given day. If the casting time is only a bonus action they will pretty much have this AC bonus every single combat encounter as there is very little reason for them to not use it on their first turn.

I really hope you can iron out some of these things and fully flesh out the rest of the spell with a list of classes that can use it and components for the spell because it sounds like you may be on to something here. I look forward to what the next versions of your Abjured Armor may bring to the table, good luck!