>>11051114>C-Weapon[s:lit]...were bigger than the regular mechsThe EPHEMERA line were C-Weapons, and were identical in size, shape, and modularity to an AC (by design). The thing that defined C-Weapons isn't their size, it's that they're A) powered by Coral, meaning they regenerate energy quickly and can basically function forever without needing to refuel B) tend to use armaments that are also powered by Coral, taking advantage of Coral's high output to deal a lot more damage than a normal weapon, and C) are autonomous, using advanced AIs (that are later hijacked by the Coral itself) to pilot them.
The only reason we're able to pilot the specific EPHEMERA we cobble together from scavenged parts is because a 'design quirk's lets us stuff a functional cockpit inside for a manual override (basically turning it into 6's version of the Super Bipedal Pulverizer from LR with us playing Evangel's role), as all the part descriptions make it clear that the mech wasn't designed with human tolerances in mind and our presence in it is actually gimping it's abilities; Walter's HAL, on the other hand, has unique parts that explicitly state the AC was designed to be piloted from the start, so while it runs on Coral, it's just a souped-up AC and not an actual C-Weapon the way the rest of the IBIS line was.