MF Sorc

[whathuh]

Quite.  Just some numbers to back this up; you need 58 strength for a grim shield as opposed to 96 for a dragon shield, grim shields can have much higher defence, and they have 12% higher listed blocking.  That's already a no-brainer even before their maximum 2 sockets (for Rhyme or Splendor) is taken into account.
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Whenever I make a mf sorc, I like to get max block, as I tend to be a bit reckless. Also, pindle only uses phys attacks, so you have a 25% chance of getting hit. But anyway, I use a rhyme heater. Heaters (elite buckler) only have a str req of 77, max sockets of 2, and they have 22 base block (best in game is 24 from Tower shields and other big elites). This is much more useful than even a troll nest or grim shield, as you should already have 77 str from either skullders or tal rasha's, which are probably the optimum armors for mfing. If you are going to use a wealth breast plate, however, the ugly grim shields (or even small shield) will do nicely.