To make sure that players stay informed about the changes that came in the most recent patch, Turbine’s put out an additional dev diary about the combat tune-up that came in Update 18. There’s nothing ground-shattering here, although these adjustments are part of the bread-and-butter of fights. In the patch, the avoidance mechanic has been tweaked, the mastery stat will buff player damage, and medium armor classes can cap mitigations for less than before.
Turbine also said that combat positioning in instances should be getting more attention. “It will be much more important to skillfully position yourself behind your enemies: Enemies with high block, parry, and evade ratings will generally take fewer crits unless you’re attacking from behind.”