|What would happen if you used two wands?|
then the spell power is doubled. we see this happen in deathly hallows with three wands.
He [Harry] leapt over an armchair and wrestled the three wands from Draco’s grip, pointed them at Greyback, and yelled, “Stupefy!”
The werewolf was lifted off his feet by the triple spell, flew up to the ceiling, and then smashed to the ground.
BUT. I have theorriiieess. Obviously if an average wizard used two wands at once then the spell would be amplified two fold.
if one of the wands didnt like you, as in you hadn’t won it and it wasn’t easily swayed, it would probably not work very well at all for you regardless of how good you were.
If a below average wizard used two wands then I would think it would actually weaken the spell because I believe that the potency of the magic is within the user and so if they’re not very strong and try to push magic out through two sources it would be like splitting a whole in half and thus neither of the results would be very great.
I can only assume too that above average wizards would get drained a lot faster using multiple wands since they’d be doing double the spells. And everything needs to be balanced. Plus it would make sense as to why all these power hungry peeps aren’t running around with 18 wands strapped to their hands. xD