according to this lil news article https://www.riftherald.com/lol-gameplay/2017/6/20/15841156/new-lol-champion-void-nexus-tease
RIOT: REAV3, refers to it as "mind-infesting" as well as being a carry jungler that revisits the transformation idea. with the mention of "shadow" and the eye looking voidish (aka really really weird), my guess is that this thing will POSSESS jungle monsters. considering that the Rift Herald is just a SCUTTLECRAB exposed to too much voidborn radiation, just imagine the stuff this hypothetical mechanic would create.
my heart still longs for runes reforged but another monster to traumatize the local marksman main with is still hype worthy![slayer-pantheon-popcorn]