No. Regulus fails.
Bullshit! With a lvl4 mines Reg is the best supporter (even better than Sedna) in close-to-close combat: area damage and slowing from mines in the middle of melee will let the enemy suffer, while the team in form of UB or Oak finish them off! If they manage to flee, mark of betrayer combined with a good snipe give them the rest!
Just a matter of teamplay! No QoT or Sedna can do this in this exiting way !