How to properly use the core drill ability of DWAARP?

How to properly use the core drill ability of DWAARP? - Anonymous dentist using drill and mouth mirror for dental treatment

One ability that I never buy on the DWAARP tower is the core drill, because it seems to gets wasted on weak enemies. How does the AI work here? Does it instakill the strongest enemy or the enemy closest to the exit? What is a cost-effective usecase for that skill?

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How to properly use the core drill ability of DWAARP? - Faceless female dentist using drill and mouth mirror while curing teeth of patient

How to properly use the core drill ability of DWAARP? - A Woman Using a Drill

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How to use a diamond core drill

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