Anti field guns... Hmmm let me see... Etheric pulse bomb? A device that emits a pulse of etheric energy through the tunnels, overcharging the weapons crystals and causing them to explode. Or absorption shrouds, Shrouds which turn the enemies blast into more energy for the shroud, Or chitin shrouds (a bunch of mini shrouds designed to make it so that if one part of the shroud goes down the whole defense does not collapse, or standardized micro core crystals for our soldiers. Another thought is modifying lift crystals to create lateral thrust and see if we can't make a trim crystal which turns in relation to etheric energy signatures(Missiles). Our own field guns made out of mini lances could also work. And finally my plan Z cat special forces, or spiders.
Also power armor could be done through a puppeteer style system based on our trim powered turret rotation, I.E. where the movement of ones body parts causes a movement on the trim crystals dials? controls?, Also i was thinking they would be made from bronzewood with a bit of spider silk strategically interlaced to distribute the impact of enemy weapons. Also it might be wise to make a ether rifle, We have pistols we can scale them up.
Also Nav you and i apparently think alike.
Also if a full suit of armor would be too expensive we could make a framework that attaches to our soldiers existing armor (like the exo suits from edge of tomorrow) just an upgrade to give vertical mobility, a shroud, and increased strength/speed, plus it would let our troops potentially be able to be launched from afar without having to get a barge in range of the enemy guns.