Rommy
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Merging armies is possible. I don't think adding more art, besides the existing set list, is a good idea.
Added 2 minutes later
By the way, I just took SmallSpecialArena_Grass_Custom from the original, updated the file date to replace the one from ToE, and it worked fine.
I tried to run it in the editor, and it said the archive was corrupted. Was this because of the file date? And how do I change it, and to what?