OS means oldschool and in this shield case stands for no inscription slot and only inherent mod + shield cant be modified with a shield handle.
the arms in this case will very likely not be enough to kit out all 7 heroes with perfect runes like sup vigor, prodigy insignia, sup dom runes + equipment etc. etc. I dont think that with these stats the shield is worth more than 2-3a max.
Ah, I see. Thank you for the explanation. At least it's a step in the right direction ![]()