Damage taken reduced by 20%. Immune to Stun effects.
Duration: 8 seconds
Icebound Fortitude is a level 65 death knight ability that allows the death knight to become immune to stun effects and take less damage.
Patches and hotfixes
Patch 7.2.5 (2017-06-13): Icebound Fortitude is now learned at level 57 (was 65).
Patch 6.0.2 (2014-10-14): Now lasts 8 seconds (down from 12 seconds).
Patch 5.4.0 (2013-09-10): No longer costs Runic Power.
Patch 4.0.6 (2011-02-08): Now breaks stuns when used, in addition to providing immunity to them.
Patch 4.0.3a (2010-11-23): Now provides 20% damage reduction, down from 30% (now 50%, down from 60% when talented), and has a 3-minute cooldown, up from 2 minutes.
Hotfix (2010-02-05): Icebound Fortitude now provides 30% base damage reduction, up from 20% damage reduction. For a geared tank with high defense, this translates to 50% damage reduction, up from 40%. Tooltip to be fixed next patch.
Patch 3.2.0 (2009-08-04): Cooldown increased to 2 minutes.
Patch 3.0.8 (2009-01-20): Now reduces damage by 20% instead of 50%. The amount of damage reduced increases with bonus Defense (to about 35% for 540 Defense, but can go higher).
Patch 7.2.5 (2017-06-13): Icebound Fortitude is now learned at level 57 (was 65). 
Patch 6.0.2 (2014-10-14): Now lasts 8 seconds (down from 12 seconds). 
