overworld army upgrade

Choose an elite army and an upgrade to their weapons
1) Fine Weapons (-20,000 Gold, +400 strength)
2) Masterwork Weapons (-40,000 Gold, +600 strength)
3) Epic Weapons (-80,000 Gold, +900 strength)
4) Legendary Weapons (-160,000 Gold, +1400 strength)

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*You can only upgrade elite armies that have not been upgraded yet.