Dr. J
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Troop Skill
Build: speed increase
Gas Output: increase
Rally Size: increase

Dr. J is considered an essential hero as one of his troop skills provides a bonus to Rally Size, which at +5 adds +100,000. He also provides a +15% bonus to Build speed, and a +100% bonus to Gas Output.
As an economy hero he does not need to be evolved past level 131.
He can be obtained in Noah’s Tavern