Void not a valid option for War Node 3?



Void takes regen to 0 (or lower against opponents who can allow it; Sersi cannot be lower than 0). However, in this fight, Sersi has a regen active but does not regen any health, is receiving damage from Intimidating Presence, and I still cannot gain any charges?? What am I doing wrong here?
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Comments
So unless they update the node to Include this, we're kinda out of luck
I have yet to see someone successfully taking this node without heal block or Warlock. Someone in my ally tried with Black Cat plus Silk synergy. BC applies 25% spectres on medium attacks. So you’ve got all the usual AAR stuff from BC, plus a lot of spectres, plus despair at 3/3 and it still didn’t work.
I’m assuming the opponent was Bulls?
If “everyone” like Nefaria works, why wouldn’t Void work again…?
Void here didn't work because of Sersei's ability to have her regen bit reduced below zero.
Appreciate the help, I’m just trying to understand what the rules of the node are as they relate to champ selection….
@Herbal_Taxman
I took an enchantress on this node with void. He works, I think in OP's case it might just be some quirk with sersi...