I don't think Morde needs a huge rework
Okay, so -- I've been playing Mord almost non-stop recently, and he's gotta be one of the most fun champions to play as when he works. Everyone knows he's got a lot of problems, namely being short-ranged, immobile, and with no CC.
I won't say whether these ideas are actually any good, and I know they probably won't happen, but I have this lingering fear that Riot will make Morde something like a tank with a lot of generic 'counterplay,' so I'll say my thoughts on why his kit could be updated instead to fit today's standards. I don't think all the ideas should be implemented at the same time, but I think they'd do good in making him stand out more as his own unique role.
Creeping Death
I think this could have a lot of tie-in to mobility. Give him a movespeed boost while it's active. This inherently puts a lot more decision making on using this ability. 'Do I want to use this ability for the defenses and AoE in this duel, or do I want to wait to use it to escape or chase that low health enemy?' Obviously, it has a really long duration, so I think a better idea than just a whole 6 seconds of really fast movement would be it being a massive MS buff decaying to something more moderate. This would give him a good burst of speed and make him much harder to escape from if he keeps it.
Siphon of Destruction
Now, this idea's a little out there, but give it more range and make it still hit in the same area cone. What I mean is, it still hits in the same radius, but you can aim that radius to hit farther than just from Mord's hitbox.
Understandably, that's pretty hard to balance, but I think it could be made simple; give it an increasing travel time from where it casts, from the same cast time at point blank to something reasonable at max range, with a noticeable line traveling to that area, or just the incoming cone nuke itself being visible. Depending how close you aim, the hitbox would always be locked to Morde to prevent you accidentally mis-clicking it at close range. Let's say something like within 200-300 units, the cone will be locked to him. This offers him a chance at having long-ranged poke with the counterplay of it being both delayed and visible to the enemy.
Children of the Grave
There's not really a lot to do, but aside from the occasional obnoxious shield, I think making it tick down faster would be a good improvement. Alternatively, he could just gain increased movement speed when moving to the champion he's inflicted with it, instead of W giving him an MS boost. This gives him a strong feeling of 'I threw my ult and now I'm going to fuck you up' now that his victim will have a harder time escaping his grasp. It also has no effect on him when he turns around; which accentuates his strength as someone who wants to stay and fight and chase you down and enslave your soul.
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I'd really like to see most of his kit intact through any form of rework he might get in the future. I like his identity and I think his kit only needs a few tweaks to give him a strong place in the meta. Please tell me what you think for the purposes of friendly discussion, thank you
Mordekaiser es numer uno... HUEHUEHUEHUEHUE