PvP Power Nerfs in 5.3, and Other PvP Stuff.

This will change your gearing, gemming, and maybe enchanting choices. It seems to me that this will make high level PvE gear valuable in some PvP situations, if it’s significantly higher level than the PvP gear that you have. Go raiding, get the hot gear, hop into the BGs and be competitive.

Resilience

Resilience has been removed from most PvP gear.All characters now have a base Resilience of 65%.Resilience gems and enchants will continue to be available. PvP gems have been nerfed by 50%. See below.4-piece PvP set bonus for all Season 12 and 13 armor sets that granted 1000 Resilience now grants 1000 PvP Power instead.

PvP Power

PvP Power will remain exclusively on PvP gear.PvP Power conversion ratio to obtain 1% damage at level 90 has been changed from 265 to 400. Basically this means that PvP power is worth 2/3 of what it was before. Along with the PvP gem nerf this will give you good reason to use pure stat gems Vs PvP Power gems. Your 160 Int/Ag/Str will be worth much more than the 160 PvP Power on blue gems.PvP Power bonus to healing is now based on class and specialization. Healing specializations (eg: Resto Druid) receive a 100% bonus to healing from PvP Power.Damage specializations (eg: Feral & Balance Druids) for Druids, Monks, Paladins, Priests, and Shamans receive a 70% bonus to healing from PvP Power.All other specializations (eg: Guardian Druid) and classes (including tanking) receive a 40% bonus to healing from PvP Power.

Enchants and Gems

The amount of PvP Power and Resilience on gems and Mystic Cogwheel have been reduced by 50%. PvP Gems are now the same value as gems with your primary stats. Glorious Tyranny weapon enchantment now grants 600 PvP Power instead of 400 PvP Power and 200 Resilience. The Res. portion has been eliminated.New weapon enchantment: Bloody Dancing Steel is functionally equivalent to Dancing Steel, shares the same visual effect as Glorious Tyranny, costs a scroll of the base Dancing Steel enchant, and requires a 2200 rating. The only difference is in the visual effect.New weapon enchantment: Spirit of Conquest is functionally equivalent to Jade Spirit, shares the same visual effect as Glorious Tyranny, costs a scroll of the base Jade Spirit enchant, and requires a 2200 rating. The only difference is in the visual effect.

PvP Gear

Tyrannical weapons no longer have a conquest-earned prerequisite to purchase them.Tyrannical Gladiator’s Tabard and Tyrannical Gladiator’s Greatcloak are available as new prestige items at 2500 rating for 1000 Conquest Points.Season 13 Tyrannical gear had their item levels increased to ilevel 496, up from ilevel 493. Weapons and shields/off-hand items remain unchanged at ilevel 498.Season 13 Tyrannical Elite gear had their item levels decreased to ilevel 496, down from ilevel 512.

Misc. 

A rundown of the 5.3 changes:

Hansol discusses Fire Mage gemming, but this should be applicable to any class and spec.

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