Mordekaiser's identity.
Old Mord was a large, lumbering, master of metal. Who's play style was about pushing his lane and punishing his opponent. since he had no cc or mobility, he was all about going all in all the time. He was a large armored man who carried a weapon that very few could even wield and mastered magics that even fewer have even heard of. His spells worked perfectly with this character. His Q mace of spades was him swinging it with insane force,if you were fortunate enough to have allies nearby it would cause the force of the blow to echo out towards them. His W was a swirl of metal shards to rend and tear anyone dumb enough to get near him. His E was a powerful spell that instantly caused spiky maces to erupt from the ground in a cone in front of him with just a simple flick of his wrist. And finally his R which was his way of showing you who's actually in charge by instantly draining a portion of your life force and using it to reinvigorate himself while also applying a dot to you that would drain your very essence and if you succumbed to this, you literally became his slave in your afterlife.
New mord looks exactly like old Mord. But lacks any of his actual physical or magical strength and should've never beeen called the master of metal since he can't play a solo (lane) anymore. His Q requires 3 swings for him to build up enough momentum to even use his mace to harm someone. His W requires his babysitter to be within hand holding range to even be cast, and within hugging distance for it to actually do damage to someone. His E is a big fancy looking fart cloud he wafts in your general direction and does about as much damage. (I want to point out that it is not as fast as his earlier version which is a very important thing.) And finally his R which is more or less the same but has the added affect of making sure he's never alone if he takes the dragon ghost gimmick.
In summary old Mord was a force to be reckoned with which made perfect sense since he's a massive necromancer general from the shadow isles who didn't need babysitter at his side but made sure that the enemy top or mid lane needed one. While new Mord can't do a thing on his own but maybe dual someone dumb enough to stand there long enough for this wimpy wannabe to build the momentum to hurt them. Tell me again how you kept his identity together with this rework?
I wanted to mention his passive separately since I feel it what makes Mord Mord besides his ult. It used to be an ingenious way of justifying him having health cost spells without overlapping into Vlad or Mundo territory. It was also what made him so fun to play. But now it's like hey we kept it on him but if you want it to be useful you had better build a ton of health. Like what is that? Was it because he had a better shield than one of your fan favorites? (Yasuo). Now it can't be counted on unless you could've already survived whatever was thrown at you which makes it pointless.
I would also like to mention Mord can no longer be played in any other game mode without being a troll pick.