Paladin · Protection · tier 1 · from level 10

Redoubt

Rank 5/5

Damaging melee attacks against you have a 10% chance to increase your chance to block by 20%. Lasts 10 sec or 5 blocks.

Doesn't change the damage or healing of any Paladin spell.

Averages, counting crits and misses, for a level 60 Paladin with a typical weapon and no other gear or buffs, against a target your level. Worked out from the game's own data, the same way as the Foresight addon.