Tanks of dungeons, how do you become immortal?

[OtakuGam3rLegend]

Now I'm not asking for a detailed list of amor, pets or what ever it is you use to not die, the wiki exists for that. However, I see archers who completely carry f5 and f6 runs and don't even seem to take damage. Now, I'm trying the get gud method but I have a thing known as 'skill issue' that I'm working on. So any tips for a budding tank?

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