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As a linguist, I can tell you that "Tactician's" is the genitive form of "tactician." English doesn't really have grammatical cases, but it does have the possessive 's. I don't know what the author of this map meant when they named it, but I would translate it as "Tacticians' Corner," keeping in mind that the meeting place for the heroes (the exit from the one-way teleport) is located in a corner.
