Allow him to move around during death and lower the total time from 7 seconds to 4 - 7 seconds. ( Seconds could rank up with each point put into R at 6 , 11 , 16 respectfully.)
A much more interactive 
There he is now viable mid again.
I dont play him at all but i never see the guy he could use a love tap here and there.
thoughts ?
Handy Sandy 3 votesHe was always viable..?
zarxus12342 votes[{quoted}](name=Chroma Spell,realm=NA,application-id=3ErqAdtq,discussion-id=abgkpvhV,comment-id=0000,timestamp=2017-02-14T02:31:30.189+0000)
He was always viable..?
he is viable? karthus is really bad right now dude. so dont say stupid things such as he is viable.
Mecha MaIphite3 votesWhat? How is he bad?
If you think Karthus is just an R bot who gets completely nullified just because someone built 
, you're not playing him correctly.
blackcat13001 votesNo it is the general lack of mobility, resilience, and complete reliance on team comp that makes him bad. Plus if you get interrupted on your ult you don't get a 50% off discount on the cool-down like other champs.
Plus late game he dose no damage to any tanky champs do to his low base damage.
40/60/80/100/120 (+30% Ability Power) Other champs do more damage and part of their damage is dealt as true damage.
Handy Sandy 1 votesWhat makes him not viable?
isn't an entire counter. A good karthus will wait for it to go down, or any other counters towards him, and then ult if he even has to.
Jorencice3 votesI say triple his Q damage.
Dark Nephthys1 votesReducing his time in his passive will really hurt him, that means if you died then you would have to use his ultimate the second you died or miss your chance, maybe you could get off 1 Q but still would hurt him. You don't see him much because of the meta, he is easy to jump onto and kill and with some Assassins being strong right now, it makes it hard for him. Also since he is a scaling mage that buys 
he is easy to counter/kill with the meta being towards snowballing with lethality etc.
Darth Sidiouss1 voteshe cant move when he dies hes forced to stay at one spot a huge fight can move from where u died the seconds missing would scale back up by 16 to compensate. For im guessing Riot limited him in the spot he died to prevent any over reliant after death damage.
Giving him the chance to move after death is a big impact on how he interacts with everything.
Dracocrash1 votesby reasonable karthus buff do you mean crazy, stupid uneeded buff?
meowwow71 votesi've had better times with his jungling especially power farming raptors and krugs at lvl2 after blue :3
blackcat13001 voteshear is a reasonable buff revert wall of pain back to how it was in season 2 or
Before
Lay Waste Cost: 20/26/32/38/44 Mana Range: 875 Karthus unleashes a delayed blast at a location, dealing damage to nearby enemies. Creates a delayed blast at Karthus' cursor position dealing 40/60/80/100/120 (+30% Ability Power) magic damage to each nearby enemy.If the blast hits only a single unit it deals double damage.
After
Lay Waste Cost: 20/26/32/38/44 Mana Range: 875 Karthus unleashes a delayed blast at a location, dealing damage to nearby enemies. Creates a delayed blast at Karthus' cursor position dealing 40/60/80/100/120 (+30% Ability Power) magic damage to each nearby enemy this is doubles for champions and large jungle mobs.If the blast hits only a single unit it deals double damage and tripe damage to enemy champions and large jungle mobs.
Now you kill in 3-4 single target hits insted of 8-10 single target hits. 4.5-6 seconds to kill vs 12 to 15 seconds to kill. early single target damage 120 from 80 minus mr. most champs have about 500 bace health.
Their a buff so small you want notice it so long as you are doging his q's*[zombie-brand-mindblown]*