A direct hit was a kill for as long as I remember, but now about 25% of invaders inexplicably survive it with about a third of their health left. Seems to correlate with the recent patch to bottom tree solar warlock.
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Its probably leaving them with some health left because it exploded on some surface near them, they had light level advantage (what's your light level?) Or they had over shield. Jotuun does not need a buff so bots like you can get free kills lmao