From wow.incgamers.com

Statistics

Talent Improvements

Arcane Tree

Talent: Improved Mana Shield
Effect: Decreases the mana lost per point of damage taken when Mana Shield is active by a %.
Statistics: Rank 1 = 10% Rank 2 = 20%.

Threat Level

This skill causes no amount of Threat.

Uses in PvP

Please feel free to add a bullet list of uses within PvP or editorial if you have more to say. What use is it against other builds, what skills can it be used to counteract or prevent. What skills does it work well in combination with.

Uses in PvE

Please feel free to add a bullet list of uses within PvE or editorial if you have more to say. Which creatures/bosses in particular is it useful against. What skills does it work well in combination with.