Hopefully this will be clearer in Book IV, with an little more coherent narrator… [flapper]
At the moment it feels like overly complicated word building… [huh]
Before your ‘explanation’ I saw Animus as Spirit equivalent of Matter and Antimus as Spirit equivalent of Anti-Matter. With Necromancers playing with Anti-Matter via magic (like an Antimatter Reactor with technology).
And it made sense, that Anti-Matter destroys Matter and vise versa…