Is this new goblin builder worth the gems?

The "Job Hunt!" event introduced the Goblin Laborers, a pair of goblins in the Home Village.

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Goblin Builder works when all builder slots are full; Goblin Researcher activates during Laboratory upgrades.

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Requirements

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Goblin builder cost 40 gems per day.

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Books have the advantage tho that you instantly have the upgrade.

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If you can wait for the upgrade time, opting for goblin builder or researcher is highly recommended.

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