You can easily be offtanky with items like Roa, Rylai's, and Zhonya's on KArthus, and have plenty of damage.
Works great.
Works great.

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It's really strong to have the giant AoE slows on a pretty tanky champion.
It's not the only way to play Karthus, but is is a good way.
It's not the only way to play Karthus, but is is a good way.

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Having lots of health items doesn't make you an off-tank.
It just makes you more formidable.
An off-tank has the specified role of rushing into the fray, and attacking the enemy squishies; and actually has abilities that boost their survivability, such as defense-steroids (
Drunken Rage), sustain abilities (
Iron Mantle), or specialized CC (
Equilibrium Strike).
Karthus... Just runs into the fray and does tons of damage.
The extent to a good Karthus' player surviving is simply kiting and finding the best possible spot to die where the team can take advantage of his
Defile AoE.
There's no real tanking involved, you go in half-expecting to die, hoping you won't, and not expecting to live.
It just makes you more formidable.
An off-tank has the specified role of rushing into the fray, and attacking the enemy squishies; and actually has abilities that boost their survivability, such as defense-steroids (



Karthus... Just runs into the fray and does tons of damage.
The extent to a good Karthus' player surviving is simply kiting and finding the best possible spot to die where the team can take advantage of his

There's no real tanking involved, you go in half-expecting to die, hoping you won't, and not expecting to live.
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Rylai's RoA Houglass on Karthus is a very effective offtank.

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That's not the proper use of the term "offtank" :P
Offtank is synonymous with the lesser used phrase, Anti-Carry.
Karthus, no matter how bulky, is no anti-carry. Building health just makes him "tough" at best.
Offtank is synonymous with the lesser used phrase, Anti-Carry.
Karthus, no matter how bulky, is no anti-carry. Building health just makes him "tough" at best.
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That's just you zoning into your own determined definition of what an Offtank is, which is completely irrelevant to the point I'm trying to make.
Anti carry means anti carrying. Period.
Off-tanking is not anti carrying. Period. In no way shape or form.
An Offtank does not have to anti carry.
They also can often perform initiations, bang with bruisers, peel targets off of carries, etc, etc, etc.
Again, loooots of scenarios in which and Offtank's functionality is not that black and white.
However, when I play Offtank Karthus that is essentially what I do. I walk at the carry and do my best to kill it before I die. Do some more damage, etc.
I also generally run revive on my Offtank Karthus, which makes the most of the resistances that I build on Karthus, by giving me a decent chunk of HP to top it off.
I haven't done it a great number of times, but it worked pretty well for me.
Anti carry means anti carrying. Period.
Off-tanking is not anti carrying. Period. In no way shape or form.
An Offtank does not have to anti carry.
They also can often perform initiations, bang with bruisers, peel targets off of carries, etc, etc, etc.
Again, loooots of scenarios in which and Offtank's functionality is not that black and white.
However, when I play Offtank Karthus that is essentially what I do. I walk at the carry and do my best to kill it before I die. Do some more damage, etc.
I also generally run revive on my Offtank Karthus, which makes the most of the resistances that I build on Karthus, by giving me a decent chunk of HP to top it off.
I haven't done it a great number of times, but it worked pretty well for me.

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Most offtanks ARE anti-carries.
But then again, everyone is supposed to kill the enemy carries.
And Karthus is not an offtank.
But then again, everyone is supposed to kill the enemy carries.
And Karthus is not an offtank.
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Oh thanks for the clarification Searz.
Good to know Karthus isn't an Offtank.
Good to know Karthus isn't an Offtank.

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RoA is fine for offtanky casters. I like it on Karthus and Swain.
Karthus is an offtanky caster? Since when?