>>11052832>would make a good enemyIt literally IS an enemy at one point - you fight a still-functional one during Exploration Depth 3 in Chapter 4, where you get locked inside a reactor that's about to explode while it ambushes you from above. Another one with a different load out serves as an ally piloted by Ayre on the Alea lacta Est route, and you find a few ancient wrecked ones from pre-Fires of Ibis that have old logs that you can salvage from their databanks.
Also, the shape of the EPHEMERA's Core and legs reminds me of Filial/the Martian AC from the last mission of AC2, while the SOL's head and arms also seem to draw inspiration from it.