Just reached Garulea, found it has the Cross barrel gag.
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EDIT: So, I'm playing through the new story update and... well, this is getting interesting. One of the first things they reveal is AE's Ashtear having made a Gate Key... er, Holder. But same purpose pretty much. Not that the party gets to use it, but obvious reference is obvious.
And now further in I'm seeing an NPC mention Zurvan here as well, just like in Chrono Cross.