Didn't go in F4 yesterday, but if the tank buster in it is multi-hitting magical then IB + Vengeance/Thrill+Conv should be fine. Glad to see there's a new fight where DRK can use it's mitigation kit, though.

F3 tank buster (assuming you mean the hands one) is physical, no idea about the human form swipes but I imagine it's the same. Tether in tornado phase is magical but doesn't really need to be mitigated anyway.