Curious why there are no good options for tanky Magic Resistance?
There's Spirit Visage, Adaptive Helm, and Abyssal Mask - only these three give health and MR.
Visage's passive is useful in most situations, increasing healing, but only some champs can really take advantage of it. If you don't have healing, or your team has no healing, it's significantly less useful than it could be.
Adaptive Helm, again, you can only really take advantage of the passive in certain situations, many times it's not particularly helpful.
Finally Abyssal Mask, again it's only useful in certain situations, if you've got an AD-heavy team and/or you're an AD tank, it's passive is pointless.
All of these are pretty expensive to upgrade, though they do significantly improve the MR of the stuff it builds from, but I'm curious why there are so few items, and why all the existing ones are so situational.
Compare this with Armour, you've got Randuins, Sunfire, and Deadmans that are all generally useful in nearly any situation, then Thornmail, Knight's Vow, and Righteous Glory that are all situationally useful, though still useful more often than any of the MR items.
I'm not saying we need a thousand MR + Health super tank items, mages have hard time bursting tanky people down as it is right now, but I'm curious why it's so skewed and why there aren't a few more useful MR items. As it is just stacking Negatron Cloaks at 40 MR for only 720 gold and grabbing health is a pretty great option for early MR.
For non-tanks there's quite a few utility MR items that are pretty useful in certain situations, but if you're just going for a good old tank, it's a challenge to get more than three MR items that are useful.
I was wondering what people's thoughts are on it? I generally only play tanks/support so I don't know what it's like from a mage's perspective, do you think there should be more MR items? Am I missing something obvious?
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If Magic penetration was anywhere close to balanced, magic resist would feel way more impactful
"am I a joke to you?"
is decent, the rest are garbage. Mr items should get at least a buff of +10 mr, because they are incredibly useless.
is the only good MR tank item even though it’s the only one. While it’s true that against about a third of the AP threats in the game it’s passive isn’t effective, the pure MR and health are usually enough to at least dissuade those same champions from attacking you in the first place. It to me is the MR version of 
passive in a item that gives around 80 MR, similar to how
should be a more general tank item. It should have a bit of armor and heath shaved off in exchange for MR. Make it's build path
+
or something akin to that.