Wanna Tank!!
If you want to tank, build a tank. Seriously. Certain tank combinations will be pushing out tremendous amounts of damage anyway.
I'd say stick to brutes. They can attain Tank like levels of mitigation and pump out loads more damage.
When there is no room left in Hell, the Dead shall walk the earth.
Invulnerability is a decent choice for a tanking brute. You get good resists and a decent amount of defense, which can be augmented with pool powers and set bonuses. And since you can get 50% Defense Debuff Resistance, you'll be less likely to suffer cascading defense failure than a pure resist-based brute that added defense. It's got an excellent taunt aura too, though you do have to wait a while for it.
@Roderick
If you want to tank as a brute, Skaith, then an Elec/Stone is one of the best ways to go. That being said, if you have some spare change laying around, I'd roll up a /Invul or /Shield Brute, then softcap their defenses and throw in regeneration/recovery/recharge/damage IO boosts to taste.
I personally like Super Strength for tank-types due to the mitigation from Foot Stomp, but other primaries with AoEs can be just as nice. I've seen a few EXTREMELY cool Stone Melee/Shield Brutes who could throw out big damage while keeping enemies on their toes. Fault is an extremely cool PBAoE Knockdown/Stun power that might not deal DAMAGE, but it certainly attracts enemy attention. Pair it with the Earth Mastery APP's Stalagmites for BIG stuns, which make for big mitigation. At the same time, you'll be swinging around that massive Rock Hammer powered both by Fury and Against All Odds.
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Rolla Tank!!
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I have a DM/Invl brute that makes a pretty decent proxy tank, not a painfully slow as /stone.
i used to play 2yrs ago when ele/stone brutes rocked!!! i still love tanking and love the brute style, i wanna be a great tank for aoe and bosses, is ele/stone still good, or what are some suggestions for tanking styles now?