Paladins tanks are the worst caster tanks of the three. They rely on blocking for both threat and mana regen. Warriors and Druids don’t. Giving paladins the ability to block spells means:
- Caster bosses eat reflective threat, just like a melee boss
- Blocks return 4% mana on spell cast, just like a melee attack
- This is an activated ability through Holy Strike; you control when it goes off.
- If a boss is just a straight caster (for example, Leotheras the Blind Demon phase), you can just use it at will and generate even more threat.
If there’s an encounter where a spell that can be blocked would eat through a charge that might allow a crush (say, we count the marks on 4 horsemen as blockable) you just don’t cast Holy Strike until after the mark (or whatever cast) goes out.
This is a nice bonus and keeps you from having to dump as much mana into consecrate as you otherwise would. In a situation with multiple mobs and more than one tank, that’s a strategy issue on your raid’s part if you let the crush happen.