Overwhelming Force KB to KD in Gravity
I think Repel and Knockback are treated as different things by this proc. You may want to check the power's description to see if it's KB or Repel. I don't have a grav to check myself, sorry.
It doesn't do anything with repel.
Propel should certainly be reduced to knockdown, though.
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I've tried slotting overwhelming KB to KD in propel - however , it still does knockback in its narrow cone
I've also tried slotting in Singularity - again singularity's repel field is throwing targets away - i would have expected knockdown