Well when I play my magblade in under 50 it's kinda like I'm immortal with all those heals we've got on nb. I think it's due to healing as quickly as people do damage to you combined with high health, damage shields, and/or high resistances. I know I've come across other super tanky players and neither of us come close to dying if it's just 1v1 lol you're probably just encountering players that are skilled and know how to build themselves properly as cheats seem kinda unlikely, but I'm on ps4 so idk how prevalent cheating might be on pc