Anybody willing to help me out with getting the Malleus Monstronum Psyker Penance (While on Heresy Threat or higher kill a Monstrosity after damaging 50 of its health with your Brain Burst)?
Willing to help out if you also need it.

EDIT: Managed to find someone that helped me with the Penance, I'd still be up if someone else needs help with it, (The penance being locked behind Private Matches makes it troublesome)