question

[championboost]

some pets give damage mitigation and some damage reduction whats the difference

[chulakamulaka]

According to Google's definition, they're the same thing.

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[VISHNU (sparkstrom)]

Test*

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[Futumsh]

'Damage Reduction' is a multiplier, you only get benefit from the best one (and only if you don't have a debuff of that type), and applies to all sources of damage.
'General Mitigation', which I don't think appears in text anywhere but is used for some things, is the stacking version of Damage Reduction.
'Armor Mitigation' reduces damage taken from sources that do not ignore armor, and stacks, but is subject to maximum armor effectiveness rules. Armor Mitigation is effectively the stacking version of Armor Multipliers, but does not appear in your armor stat.

There were a few things incorrectly labelled 'Damage Mitigation' which should have said 'Armor Mitigation' (Blacklight, Tainted 76 set proc buff) - those labels are fixed with today's update.