I would say Halflings.
The enemy would hit the field of battle, only to find nobody to fight. Suddenly, they would find their knees painfully pierced, their crotch punctured, their kidneys shanked, and could only stand back helplessly as they were pelted with a painful barrage of sling stones cracking their skulls. With expert marksmenship, a Halfling fighter with a good sling is nothing to laugh at. Or worse, they could be the victim of a Halfling Tunnel Rat attack, the very ground beneath them collapsing and little hands holding little daggers stabbing the crap out of them as they fell helplessly into a brutal tunnel pit attack. (Halfling Clerics can develop special magic to shape hard earth like clay... Tunneling is one of their special attacks)
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