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Collectable Hero
I think they should make a greater use out of single player, so they should add a Goblin King alter that you place in your base once you beat(one star) the final level. Like gems, you find 4 corner parts under rocks and trees and stuff. Once you get all 4 corner parts you summon the goblin king.
Stats:
1500 health
100 damage(2x to resources)
speed: same as goblin
ability: Goblin Dash, The king dashes at twice his normal speed, and jumps walls. The gob king regains 100 health. He creates a ring of jump spell, and summons 5 goblins, all goblins within range of the area gain speed and jump walls. During this dash they gain 30 damage. This lasts 4 seconds. (Unlocked at lvl 2)
Only upgradable once by finding 100 goblin skulls, the only thing the upgrade does is unlock his ability. Skulls are found under trees and rocks like gems.
He has a recharge time of 30 minutes at both levels, and cannot be gemmed in.(That's right gemmers you might have to work for something.)
Even though he cannot be gemmed, you can use gems to upgrade his health(1 health gained per gem) and damage(one damage gained every 3 gems).