Well I may not be the best at team-making, but a possible idea is to use Sanctallion as cheap fodder for Ritual IV as it can stun the opponent for a bit (A quick knock-backer like Remus can deal with any Stun Counters).
Edit: @Josuinho is the real void master here; he has used to her full capacity and knows a bit more than I do.
Donāt make a team around her nor do what josu did because icefang is everywhere and his repulse makes voidress a liability and you canāt even block it with a protecter. I recommend using her for eclipse and to get rid of death revenge monsters. Never kill your monsters!
The problem here is if you killed 2-3 of your monsters already, you will be in a bad situation. Why not just play around good monsters like dracorosa, then link water or link water with ducy etc. There are so many better things than to waste a fl for voidress only for it to be countered by a single monster that everyone runs at 5-6th spot. Voidress should not be built around but can be played quite effectively in the mid or back of the team and not the fl, IMO.
At current pvp speeds, carrying Void is very difficult. If there is mythic horse like Dont89, it is too great. I am considering playing void in pvp, if the test does not work, she will have to sit outside