Efrideet's spear - take a knee, armor piercing rounds and final round.
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Do you know what level those enemies are? Because if they aren't 32 and you are that could explain why they got 230 and the last one was a 32 that got a final round 232. The spear has plenty of impact left over to kill a guardian with even a scratch so a lower level against a spear could possibly explain these kills.