Bone Shield

Bone Shield is a Blood death knight buff, caused by Marrowrend.

Improvements

 * Blood Tap
 * Foul Bulwark
 * Spectral Deflection
 * Tombstone (death knight talent)

Notes and trivia

 * AoE's, DoT ticks, auras and bleeds do not consume bones.
 * Bone Shield is multiplicative with Icebound Fortitude.
 * This ability was mentioned in the April Fools' Day patch 6.1.4 Evil Patch Notes: "Bone Shield: now with 50% more calcium!"