Bone Shield

Bone Shield
	Bone Shield; Level 55 Blood death knight ability; Passive; Surrounds you with a barrier of whirling bones, reducing all damage you take by 16% and increasing your Haste by 10%. Each damaging attack consumes a charge. Lasts 30 sec or until all charges are consumed.;
Usable by
Class	Death knight
Other information
Level learned	55
Affects	[Blood Tap], [Foul Bulwark], [Spectral Deflection], [Tombstone]
Related buff
	; Bone Shield ; Damage taken reduced by 16%.; Haste increased by 10%. ; Duration: 30 seconds ;

"Macabre, but effective." ‒ Darris Leafshade^[1]

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

Improvements

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!"

Hotfix (2016-08-16): Bone Shield now reduces damage taken by 16% (was 20%).
Patch 7.0.3 (2016-07-19): Redesigned into a buff caused by [Marrowrend]. Now also increases haste.
Patch 6.0.2 (2014-10-14): Charges can now be consumed at a rate of once per second (up from once every 2 seconds).
Patch 5.0.4 (2012-08-28): No longer causes the death knight to deal more damage when active. No longer cost an Unholy Rune.
Patch 4.3.0 (2011-11-29): Now has 6 charges, up from 4.
Patch 4.0.6 (2011-02-08): Bone Shield now has 4 charges, up from 3.
Patch 4.0.1 (2010-10-12): Moved from Unholy Tree to Blood Tree.
Patch 3.3.0 (2009-12-08): Reduced to 3 bones from 4 and duration increased to 5 minutes. Tooltip corrected to indicate the player has the correct number of bones.
Patch 3.2.2 (2009-09-22): Cooldown and duration reduced to 1 min, and number of charges reduced to 3.
Patch 3.1.0 (2009-04-14): The cooldown has been increased from 1 min to 2 min.
Patch 3.0.8 (2009-01-20): The mitigation has been reduced from 40% to 20%.
Patch 3.0.2 (2008-10-14): Added.

Bone Shield
Bone Shield Level 55 Blood death knight ability Passive Surrounds you with a barrier of whirling bones, reducing all damage you take by 16% and increasing your Haste by 10%. Each damaging attack consumes a charge. Lasts 30 sec or until all charges are consumed.
Usable by
Class	Death knight
Other information
Level learned	55
Affects	[Blood Tap], [Foul Bulwark], [Spectral Deflection], [Tombstone]
Related buff
Bone Shield Damage taken reduced by 16%. Haste increased by 10%. Duration: 30 seconds