Era Restricted Units for Warlords & Co.

[Magus]

Am I correct that only IR, NR, and EotH (primary three factions) have units that lock/unlock based on era?
Is this due to an engine limitation?

[Ordo]

That's just how it is for the moment.

[Slornie]

The way we lock and unlock units between eras is based on faction-based story scripts.  Unfortunately these scripts are only available for the vanilla playable factions which for us means Empire, New Republic and Empire of the Hand (uses FOC's Underworld entity).  For all factions beyond that we're limited to unlocking units based on the GC reaching a particular tech level (eras as we use them) which is far more restrictive - and we can't lock units that way at all.