One use only. The pendant may be used at the start of any Lizardmen player's Close Combat phase. For that turn only, any enemy unit that is in contact with the model using the pendant will strike last in combat - even striking after great weapons and Zombies! If an enemy has the ability to always strike first, then on the roll of a 4+ they get to attack first; if they roll a 1-3, then they too will strike last.