Invincibility - IO Slotting
Um, as I recall the to-hit buff builds up kinda quick as it is... Your base to-hit is 75% as a player, and your final to hit chance is (To-hit-Targets Defense)*ACC mod...
I'd go mainly with defense myself because of that.
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SLOT DEFENSE
that is all.
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In mine, I slotted the Perfect Zinger Change for Psi Damage proc (I love it, but it's no longer possible), the Buildup proc from a tohit IO set (turns out to be practically worthless), then all defense.
As a tank, I would say defense is more important than to-hit buff.
If you've got big bucks (and are near level 50), get Cytoskeleton Exposure HO's. They enhance to hit buff, defense buff and endurance reduction - best of all possible worlds (which is why they are pricey).
Back in the days before IO's, and before I was high enough for HO's, I had 1 to hit buff, 1 end reduction and 3 defense buff.
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... why wouldn't you put defense in Invincibility? It's your best source of +def.
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Tank, scrapper or brute, you're going to want to fully slot it for defense. (i.e., up to the ED cut-off of 56%) Invinc is a key power in the Invul set because of the defense it provides; the ToHit bonus is just gravy.
Invincibility is a relatively low-endurance toggle, so if you're crunched for slots more than for endurance, you can skip slotting in for end reduction. But with SOs, definitely 3-slot it for defense, and if you can spare the slots, throw a ToHit or two in there. But slotting the ToHit is definitely optional, slotting for defense is definitely not, IMO.
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Slot it for Defense, the ToHit doesn't help you much if you're killed because of lack of Defense.
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There are two options, Defense Sets, or To Hit Buff. Which one would I get the most benefit from for this power?
I am leaning towards To Hit Buff, but will that actually improve my chances of hitting or not?
Any ideas?