Also tanking with less than 5p of heavy will leave you with less than 20K health buffed, so you will require more points in health or lord mundus to reach 25K which is the bare minimum. Overall you are better off using 5p heavy anyway. Tanking vet dungeons with less than that is pretty unreliable. I've tanked vRoM and vCoS HM with 22K health on a magicka sorcerer but I won't recommend it.