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Block Cap
After you are Uncrittable, you should start working towards the The Block Cap. This may be a new concept for Paladin tanks, but it really isn't. The Block Cap is what used to be known as Uncrushable, i.e. a combined Miss, Parry, Dodge, and Block of 102.5%. Once you reach that point, any additional Block Rating falls off the table. You are 'capped' on the amount of Block you can have. It should be noted that since Holy Shield was changed to have its duration be longer than it's cooldown, it is now safe to assume 100% uptime on Holy Shield when calculating your Block Cap, however, don't make the mistake a certain Paladin I know (who shall remain nameless) made and continue to count Holy Shield at 35% unless you plan on continuing to wear the Libram of Repentance. Holy Shield is only 30%.
Being at the Block Cap is very helpful because it means that every unavoided attack from the Boss will be a Block. Paladins are the only class now that can stay Block Capped 100% of the time. Each Block takes off damage equal to your Block Value. If the Boss hits for 9000, and you have 900 Block Value (not unreasonable), you effectively shave off 10% of the damage each and every hit. That can add up to a huge amount of damage reduction over the course of the fight.
It also provides Paladins with the most predictable damage intake, and makes Paladins the easiest tank to heal.
So you can't be Crit, and every incoming attack is a Block at the worse case, what's next?