Been mvping lately and am completely sure that either Brandish spear on mvp's or their damage has been buffed heavily.
Using Maya as an example I calc'd on a classic damage calculator to see how much damage I would receive from her brandish. (I have raydric + bigfoot)
https://i.imgur.com/I3Rcr2Q.png This is without her powerup.
https://i.imgur.com/2hZBqop.png This is with her powerup.
On the live server I have tested many times and the damage is 2x this at least. With full reducs + 50 defense (the powerup calc that shows 15k~ being max damage) I have been brandished by her for up to 31,536 damage.
Is it possible you can check if powerup is working properly or if Brandish is working properly on MvP's?