𝐌𝐀𝐓𝐓𝐇𝐈𝐀𝐒 𝐇𝐄𝐋𝐕𝐀𝐑 𝐑𝐄𝐒𝐔𝐑𝐑𝐄𝐂𝐓𝐈𝐎𝐍 𝐀𝐔.
note: this is not my normal canon divergence for matthias (which is simply a survival au), however it is an au i would love to incorporate more on this blog. any mentions to nina are exclusive to @mercyforged in this au only.
nina takes matthias’ body with her in fjerda, trying to find a proper burial site but not being able to find anything. (not being able to let him go). while there, she has an encounter with his isenulf companion, trassel. the isenulf are said to be children of djel, making them resistant to heartrender power. but nina finds they are more connected to grisha than anyone realizes; when she touches trassel, she feels the wolf’s energy. he is a living amplifier. the reason the wolves were so skilled at training and fighting grisha was an innate connection to them in the first place. (like calls to like). out of pure instinct, trassel bites nina, very similarly to how he bit matthias back when he chose the wolf as a young druskelle. in this attack, one of his teeth comes loose — nina feels the power in it, and uses her new powers as a corpse witch to shape it into her own amplifier. the resulting arm band rests over the bite mark, further connecting her to trassel.
it’s then nina realizes something else. with amplified power, she could do what she’d tried back in ketterdam holding matthias’ freshly dead body. he would have come back wrong. now? he would come back whole. trassel becomes bonded to nina similarly to how he was bonded to matthias, and it’s this trio of bonds that makes the process possible in the first place. it’s risky but she has to do it. after working tirelessly, she comes to the last part; his heart. it’s said that when heartrenders care for each other, spend their lives together, their heartbeats become one, though one can still determine there are two people in the room. nina is familiar with this, after living with fedyor and ivan for half her life. what happens with matthias’ heart is similar, but with her own heartbeat pounding in her ears, his heart is directly connected to hers. his life force is tied to her, and no one would be able to distinguish the two hearts, as he was made for her now once more.
it takes awhile for matthias to recover fully, because his body had been atrophied for so long. but once he is recovered, it’s impossible to tell that he was once dead, except for the scar on his chest where the bullet had struck him. that is, until he moves away from nina. when he is too far from her (and her heart), he begins to decay once more. it’s not as visible to most, because a sickly green color to his skin could just be nausea, but he’s extremely aware of what it means. he doesn’t stray too far after that. it happens during nina’s worst days too, while she recovers from parem addiction. but there’s nowhere he’d rather be.
matthias helps nina complete her mission in fjerda, before returning to ravka with her for zoya’s coronation. but after that, the two of them are free to go wherever they’d like; and home is in ketterdam, with the crows. alongside trassel, who is also inseparable from the pair, matthias finds himself settling into a life he should have always seen as possible but never could until nina saved his life.