With Invulnerability, I would place the highest priority on Temporary Invulnerability, Dull Pain, Unyielding, Invincibility - and by that, I mean take them as soon as they become available, regardless of what else you might be able to select from.
Historically, the passives (Resist Physical Damage, Resist Elements, Resist Energies, and Tough Hide) have often been considered skippable. A little while back these powers were given a slight upgrade and now provide some protection against defense, recharge, and movement debuffs as well as endurance drain. I can tell you from first-hand experience that there is a definite difference to the way an Invulnerability Tanker feels with or without that added little bit of status protection. These powers can very easily be postponed until later in the build if there's something you want to pick up earlier in place of them. And, yes, they are skippable, but they are not entirely useless.
The only three AoE powers you'll have in your primary and secondary are Invincibility (at level 18), Hand Clap (16), and Foot Stomp (38).
Invincibility is the cornerstone of your defense, taunting anything in melee and buffing your defense for every target it hits each time it pulses. It is instrumental in keeping you on your feet and keeping your enemies focused on you instead of the rest of the team.
Hand Clap is a
very situational power. It stuns your enemies, but it knocks them away from you and out of melee - and outside of Invincibility's aura. That distance can cause you to lose some of your defense buff, lose your aggro, and allow enemies to turn on your team when the stun wears off. This is probably the most frequently skipped power in Super Strength. It
does have its uses, but must be used very, very carefully.
Foot Stomp is the only AoE power of these three that does damage. It also provides some soft control by knocking enemies down (not back, just down, so not out of melee). It's very useful for ramping up the aggro you generate standing in the middle of a spawn very quickly. And it's just plain fun to fire it off and watch it shake your whole screen.
I have just one more question, then I'll stop bothering you forever lol.
Bother? I
love talking Tanker. It's really no bother.