Provoke increases the change to hit by 50%. If I have already 50%, will I get 100%? Or will it be clipped to 75%?
21 Answer
Your block chance will increase up to 100% (I don't think it goes past 100% on the sheet) but your actual chance to block will be 75%.
Anything past 75% is only useful for things like Justice Lantern's passive, which gives you damage reduction equal to 40(45?)-55% of your block chance.
i.e. if you have 100% block chance* then you will get 55% damage reduction but your chance to block will still be hard-capped at 75% (although your 'sheet' stats will show 100% block chance).
*achievable even without provoke, you can use 'Hold Your Ground' passive and Blood Brother in cube for some 60% block chance, plus 16% with Justice Lantern and 20% from shield, the common setup for Invoker's Crusader.