What is the main reason behind these Tank item change
Well, i'm tired of whining over the ridiculously crude changes riot makes. They nerf all defensive items when tanks already have it bad as it is. But hey why am I angry for, playing defensive and depending on my team was never of my nature. I tried, to play support and tank... But it just wasn't for me... Maybe it's because I played many MMRPG's in the past and relied on my wits and own skill and hardlt ever played with other members. I know Riot will come to terms with these changes and within the next 3 patches will revert some if not most of them. I am just eager to see the 
rework becuse as of now he is probably the only champ that will keep me withing the Tank/Support pardigm because I love his playstyle and theme imensely. If his rework is not to my liking I will return the world of fighters and assassins
Now has the opportunity to deal 1% true damage to a enemy champion that recently got a kill. The worst part is, when they are low, he gets the approval of a mark above their head to ULT THEM DEAD.
This is also fantastic! Darius can now get dunkmaster pentas! Whenever he kills an enemy champ, he gets reset and the ability to apply ALL STACKS OF HEMORRHAGE TO THE NEXT TARGET IN ONE BASIC, AND ULT AGAIN!
Meh, just stupid crystals that his allies or him can channel to create an area that buffs him. enemy champs can channel them too giving vision
EVEN SCARIER! HE CAN DUO LANE! BUT THAT ISN'T THE WORST PART! HE CAN ULT DRAGON AND HAVE IT FOLLOW HIM AS A GHOST!