[CLARITY] Make the amount of effective HP visible to a player
For example you have 600/800 HP and 40 armor/MR. When you hover the cursor over your armor amount it says something like
> Armor reduces amount of damage taken from physical attacks. You take 29% reduced damage from physical attacks. It takes 840/1120 physical damage to kill you
Or display this number in some other way. The calculation for effective HP is very simple, probably simpler than calculation or damage reduction (at least I find estimating it quickly easy) and the number itself is more useful than %damage reduction.
This grants two things: a) new players don't have to learn how armor/MR actually works from sources outside the game b) there is absolutely no reason to require players to calculate this themselves - or even worse, with 3rd party software- just like there is no reason to expect players to keep tabs on jungle creeps themselves