Tech Tree
A web, not a list. Three arms (the victory axes) radiate from the center; your civilization sets where you enter. Path outward through minor nodes to notable historical techs, ending at your civ's keystone. Two layers: meta points unlock nodes for good; research earned in a match allocates your build that game.
Minor — +1 stat (path filler) Notable — historical tech Keystone — civ unique
source: techtree.json · keystones mirror civilizations.json bonuses