Where it come from that Damage? Graph when U die

I have got some issues with the damage deal about almost any champ that have conquer, but everyone else too, Sometimes When U get in a fight U are Cool its a 1v1, And if u die, U just think ok thats a lot of damage, U see the graph and it says that U die for almost 1500 Damage, when U have 2100 Hp, It tilts, because U calculate Bad and die, But in your head, Its almost correct, U Just dont know where it comes, I think we need a better graph when u die, to at least know why u die, Because 600 Damage just like that, I want to know where it comes minions? a Rune, The runes are in the graph