So this bug isnt yet fully confirmed but its going around that this is an easy way for you to instantly kill the games invader bosses. It doesnt seem to hard to do so just needs someone to confirm it to be working so it can be moved to confirmed.
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Second hand information, but I witnessed the phenomenon within Freemarch but was unable to determine if this is what caused it at first. They did brag about it in zone chat tho.
Presently there is a quest from the world event to "Kill invading forces with a [Death Stone]"
This quest item is not supposed to have the ability to kill elites, but it will pop them instantaneously when used on them.
The quest is limited to 5 invading creatures (including guardians/defiants) and is a daily quest.
Areas to explore:
*Use of the item within PVP
*Use of the item within WF PVP *Confirmed not working*
*Use of the item within on an opposing faction Town/Wardstone
Edit:
Additional Information
Sub-elites (Twin swords) can be destroyed with this item
Quest is called "With Death Denied"