Heal reduce item for AD champions

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Chances are that the ones doing enough damage to drop you to that point are the ones that also probably aren't going to let you walk away anyways. ADCs, melee assassins, or duelists don't care if they reduce your ability to heal when they only need a few more auto attacks or another spell cast to finish you off anyways. Tanks shouldn't be main sources of damage, so adding in the ability to apply a Grievous Wounds style passive is a bit senseless as their damage is only meant to be supplementary, to add up over time, not to directly lead to someone's death unless you LET them just sit there and tear into you.

Lookin' at you, Devourer Volibear.

Not to mention that reducing a champion's ability to heal would also mark death for most melee champions who depend on lifesteal to get them through fights. It'd pretty much destroy Irelia and Aatrox, for instance, and make Zac even LESS viable by making him unable to get the full benefit from picking up the health blobs he's dropping from ability casts. He'd end up paying more health than he'd be getting back from the blobs, and that's not how they're designed to function.

I can see why you might be frustrated with high sustain champions who have strong self healing passives, or champions who can get through a fight through self sustaining abilities like Xin Xiao or Warwick that synergize well with a miniscule amount of life steal, but that's how they're designed to play. It's up to you as a player to know whether or not it's safe to engage on a heavy sustain champion. If you make the wrong call, you give them a kill. If you make the right call, you walk away with one. But taking away a melee champ's ability to heal, when in all honesty unless someone is SEVERELY fed life steal isn't that significant, and most healing passives occur after death and don't give a whole lot or are only healing for much smaller amounts over time (Aatrox, Xin Xiao, Warwick). And as much as I hate to say it because I hate him as a champion, but even Yi is an example of why melee champs require full healing benefit at all points. If a Yi loses the ability to heal up during his meditate, he loses the ability to bait enemies into focusing on him and then sustaining through at the last moment while his allies mop up the fight. Cut his healing almost in half and all the extra armor and MR doesn't matter because he's still getting shredded to bits.

Right now, if you're playing a damaging sort of a fighter you're either going to be taking ignite if you're in lane, or smite if you aren't, as your offensive summoner spell. If it's the former, you already have a method to reduce healing. If it's the latter, your main focus shouldn't be fighting against people who are at full health in the first place unless you're ahead enough to be able to take them either way, so you shouldn't be worrying about inhibiting their healing.

There are a multitude of champions who rely on either dealing enough damage to make self healing effects useless, or on giving themselves enough sustain to survive skirmishes, that taking that away from them would be a bit too much. Heavy burst champions will just become stronger and stronger while offtanks lose the ability to sustain themselves, and supports find themselves unable to heal their teammates as effectively as they should be, especially with someone like Soraka, who's heal increases in power based on the % missing health of her allies. She should be rewarded for healing lower health players, not for trying to heal them before they drop lower than 60%.

You have ignite, and you have plenty of champion effects that can inhibit healing. You can work together with teammates to eat through people who would otherwise out-tank or out-sustain the damage you can put out. Most high sustain champions make for potent duelists, so if you're going 1 on 1 against one and you lose because they were able to last longer via sustain than you were, it's not because they need to be balanced. It's because you need to take a step back and think about what really led to your death, and it wasn't their sustain. It was your cockiness.

The bigger problem is how ineffective armor is VS a Last Whisper.

You can spend 8K gold on tank items and an ADC can make it useless with 2300 gold.

My suggestion is to make Thornmail apply Grievous wounds on top of the 30% damage reflection. Because atm ADC's are healing more than the Thornmail hurts them. Tell me of one situation where it is more beneficial to go full tank rather than mostly tank.

Well your problem is that you're ulting a hyper tank like Mundo instead of the ADC or Midlaner behind him or if you really need to kill him then you just ignite him or play an AP champion and buy a Morellomicon. Another alternative is to pick Vayne since her true damage is based off of max HP and BOTRK does %HP damage as well which means his tankiness doesn't matter. You might also play a lane bully against Swain and Mundo and stop them from ever even getting to the point where they're difficult to kill.

As for an item like this being balanced, it's not. There are so many champions in the game that rely on healing and would be screwed over by this item. Zac for example. He's in a bad position already and this item would mean they need to buff him MASSIVELY or he would be completely useless since his healing from blobs wouldn't be worth the trouble of picking them up. Aatrox as well would get fucked over by it since he needs to make a choice between healing and doing less damage and not healing but taking damage in exchange for doing more of it.

Since you mention Swain I'd like to point out that even with a blue buff his ult will drain his mana completely in a few seconds. That means that if you wait it out then he'll have no mana and have to recall or die especially since he needs to cast the rest of his spells during fights. Also don't fight him in minion waves since he restores mana everytime he kills a unit.

P.S. Deathfire Grasp's cooldown is 90 seconds. It was made higher a few patches ago to counter those pesky AP burst assassins.

Wicked Hatchet is disable on 5 vs 5 map only 3 vs 3. And witht this items you cant stop healing on mundo or swain or even olaf who remove cc :)