They seem to do very little damage in team fights late game. Yes they can do a lot of damage, but they also take a long time to do it. Late game, it take like 1 - 4 seconds to kill someone depending on how tanky they are. A lot of the damage they provide is simply not used because target die too early to make significant use.
Is it just me that feels like this?
Marshbouy3 votesDOT means Damage over time Are you telling me that it takes time for a DOT to deal damage [zombie-brand-facepalm]
xxxMadLionxxx1 votesDOT means Damage over time Are you telling me that it takes time for a DOT to deal damage [zombie-brand-facepalm]
im saying it takes to long to do any significant damage
Marshbouy2 votesBuffing DOTs into taking less time to deal damage would turn them into generic burst and would defeat the purpose of them being DOTs
oSEXYPLATYPUSo2 voteswell that would mean its damage over time ... oh wait... that is what they are suppose to do ?
i dont understand the problem
Asayake 5150glow2 votesThey're already powerful, and they are the dps keystone, not the burst keystone.
Increasing the damage would make long range poke too powerful.
Making it burn faster would make killing tanks much too easy for mages.
Catastrop1 votesThey are DoTs, that's the point of them. In exchange for a ramp up time, it will deal lots of damage throughout its course.
Titanium701 votesNo they're quite fine - especially in Teamfights they deal riddiculous amounts of DMG when combined.. IF you proc them on multiple champions.
LordGeovanni1 votesOr maybe they are doing damage over those 4 seconds and thats why it only took 4 seconds to kill that enemy.
The JigSAW1 votesThey are DoT items which means it goes over a period of seconds and not immediately.
With that said, I think Liandry's is massively underpowered for its price of 3200 gold. It gives 80 AP, 300 health, and 15 magic pen with the current health % for 3 seconds. In contrast, Luden's Echo for around the same goes 100 AP and Rylai's before the nerf was 400 health 100 AP and 40% slow.
Liandry's and Haunting Guise have the exact same magic pen amount. The only reason to upgrade is for the DoT which is rather minimal to be honest. I'd be happier if they upped damage to 100, health to 400, and magic pen to 30. But, probably won't happen. 2-3% of max health over three seconds is pretty damned low - on 1,000 health, 9% is 90. Current % health favors high health champs, max favors low health champs in damage - unfortunately, getting some champions low enough to cut healing is difficult when every item is nerfed as well as your ults into the ground patch after patch... 
