A medusa bonus has a wrong name, I7 medusa should be J8 Medusa.
I suggest a different wording for the conditional border explanation in the legend. If I read it i think that every ring of fire can attack any slave entrance if i hold prometheus, but it's not in that way. If I look at the code it's just the slave entrance that borders with the ring of fire next to it.
Maybe use the singular could help...although i strongly suggest to reword it, something that sounds like "A slave entrance can only be attacked through the ring of fire in front of it, when Prometheus is held".
Finally I noticed that on the small it's a bit hard to distinguish the symbols under the numbers (88). I suspect the small version will be a trap for many unexpert players.
A small note: keep in mind that collections are not always listed in the log.