The Force Shld reduces magic damage by 1/3 due to its Shell effect, and further reduces damage of most Elements by 1/2. It also provides 50 MBlock%, a huge value made even more effective by the Evade % bug. And it offers the highest Mag.Def of any shield in the game, and can be used by anyone. The downside is that it offers no Defense at all, but the MBlock% should more than make up for this lack.