I see, this might bring some trouble for Copen, but at the same time he is typically very prepared for these types of things. His armor is designed to resist Septima powers in general so it can always function as normal, such as against Milas’s specific Tech disabling water, and Teseo’s literal hacking Septima. This can apply to Asroc too who physically manipulates machinery, I seriously doubt he prepared for all of these very specific Septima separately as his motto during GV2 was not to specifically prepare for a single Adept but go for an all around approach- thus, I believe that his Armor really should be rustproof, his whole thing is machinery- this is a problem he has to address and has to have had an answer to when making this stuff, especially if he’s gonna be fighting all sorts of adepts all day- considering that there are real world metals that y’know… don’t rust, I don’t think armor as advanced as Copen’s would either. We can’t just assume it’s composed of iron.
Even if it did rust, Healing should not only restore Copen, but restore the armor as well (because if it only healed him while his armor is damaged like… he‘ll be immediately killed right away anyways.
(Anyways, from here below I’m going to assume that Ultear can rust him, even though the likelihood of that isn’t very high at all)
I know speed is equal but his Border’s attack speed should be way higher than his own- so it might be hard to dodge, and he has a ton of EX Weapons that give him a huge versatility advantage, as well as mobility and speed with his Bullit Dashing that’ll allow him to close in in no time. By the time his Bullit Dash system rusts (if it even does), Copen would have closed in already and start hitting with AZ Swords.
However, while Ultear’s orbs are basically useless in the presence of Flashfield‘s defense, it doesn’t mean she isn’t a threat since everything Copen throws at her can theoretically be bounced back- though AZ Swords is kinda weird, so they would more likely be negged with Power Null. But this means that Copen basically has agency.
If Ultear tries to Ice Make (which seems to be out of character if she thinks Arc of Time is useless), from what I saw on the fight it can be dodged and maneuvered around, which Copen most definitely has the capability of doing with the Bullit Dashing (if he hasn’t already closed in and not given the time to Ice Make anyways). In addition to utilizing Ghauri’s Prism Break, which is super effective against Ice
While most of the EX Weapons can be rewinded that won’t be the case for Stellar Spark (hitscan lightning attack), as it’s taken from an Adept‘s blood, and Ferrous Fangs, which is well…. Blood. Those can definitely throw her in for a loop, in addition to being capable of breaking Tenjian’s AZ Ice.
Speaking of Tenjian’s AZ Ice, I understand they can dodge Danmaku, but this is at close range with likely, a Tag (makes all attacks homing), if Copen gets in, I seriously doubt that she’ll have the time to not only deal with the AZ by negging it (she does that with Gray instead of rewind), while dealing with whatever Copen is doing (he doesn’t need to lift a finger while that’s active). If Copen decides to use Greed Snatcher while that is happening, Ultear’s done, no Magic, Statistics Reduce to human levels.
And supposedly if she does put Copen into a corner by say, Rusting (again, if she can). Copen would straight up Guilt Sequence and petrify Ultear. Considering she has to see the attack to, y’know, react to it, and Gorgon Gaze petrified immediately as soon as you look at its light, she gets Petrified. Right after that if she somehow dodges that, Copen hits her with portaled Greed Snatchers hitting from like, all directions which neg her sauce if she is so much as grazed.
If she kills Copen, Anthem Revive, and then the dude will spam Greed Snatcher in character, whist likely using all of his EX Weapons including Gorgon Gaze at his disposal.
Copen basically has an answer to everything, rewinding attacks don’t really help if you’re at point blank doing multiple actions at once, while your thing is reactionary, and even if you do succeed instant petrifying is an a-hole.