Sets: Undying Chieftain behavior

This item is part of the Undying Chieftain set -- a matched set of 3 pieces forged by a master blacksmith: the great helm "Chieftain's Will", the greaves "Stone Stride" and the greatsword "Stone Crusher". Collect and wear all 3 together to assemble the set; once complete it grants its bonus, and now and then lets you swing a whole extra round of blows. Wear only some pieces and you gain nothing extra. The helm and greaves also belong to the Bulwark set: only one of the two works at a time, whichever you assemble first.