Holy moly, I never thought that the day would come where I would see this gem again! Good ol' memories!
Edit: Yes, I know the real FoN isnt back, but atleast the Icon (could) be back. And the identity of beeing good vs magic dmg is there too.
Dominick Destine3 votesForce of Nature was better.
Sukishoo2 votesAdaptive Helm isn't exactly Force of Nature, it's missing a lot of the stats that FoN had. Plus the fact they using the FoN icon currently means little as well, they did that last time when 
hit the PBE, then it got a new icon later on.
Lord Desert1 votesDont destroy my hope yet! But its obvious that the old FoN will not comeback like it was. Warmogs and Spirit do what Force did back then. I think I must have missed the Icon for Knights on the PBE :/ But just the image brings back so many dear memories xD
Sukishoo1 votes(destroyer all HOOPPPE XDD)
I mean I do wish they keep the icon this time, so at least some part of it stays in the game :) but yeah both of those exist now to do similar things to what it used too but not 100% the same.
WoonStruck1 votesFoN granted 40 HP5, 76 MR, and 8% MS, while regenerating 1.75% of your HP every 5 seconds, regardless of combat status.
The only thing SV got from FoN being removed was more magic resistance in order to serve as a substitute end-game MR item. Warmog's got a knock-off FoN/Garen passive.
#Nothing in the game does what FoN did.
Dominick Destine1 votesregenerating 1.75% of your HP each second
0.35% per second, not 1.75% per second.
WoonStruck1 votesYou're right, forgot to put per 5 rather than second. Fixed.
RexSaur1 votesThe biggest thing about FoN was the movespeed + regen + MR combo.
This item is MR + health, thats it.