Quite surprised I haven’t seen a thread about this yet.
I noticed last Friday that the Bonecrusher (single) Thrall in Incursion now has a ranged Attack, a dark purple and black Lightning spear.
He will use it if you damage him and hang back out of Melee range.
@loving-hatred says its a lightning spear Attack from a Beastmaster thrall in PVE.
Just a heads up.