Rating

<explanation of rating> <math formulae>

Damage Rating

Damage rating increases all damage done to a target, including critical hits. Currently, the max possible damage rating is 36(76).
Formula: (100 + <total damage rating>)/100 = 1.xx modifier to damage
See Severlin's post on the official forums for more information [1].

Aetheria

Name	Rating	Max Rating	Duration	Obtained From
Sigil of Destruction	+1 Damage Rating	+10 Damage Rating	Innate	Aetheria
Surge of Destruction	+20 Damage Rating	N/A	15 Seconds	Aetheria

Augmentations

Name	Rating	Duration	Obtained From
Frenzy of the Slayer	+3 Damage Rating	Innate	Augmentation Gems

Auras

Name	Rating	Max Rating	Duration	Obtained From
Aura of Destruction	+1 Damage Rating	+5 Damage Rating	Innate	Luminance
Aura of Valor	+1 Damage Rating	+5 Damage Rating	Innate	Luminance

Consumables

Name	Rating	Duration	Obtained From
Luminous Crystal of Surging Strength	+20 Damage Rating	15 Seconds	Luminance

Heroic Destroyer Set

Name	Rating	Max Rating	Duration	Obtained From
Rare Damage Boost	+1 Damage Rating	+10 Damage Rating	Item	Rares

Trinkets

Name	Rating	Duration	Obtained From
Augmented Damage I	+1 Damage Rating	Item	Gearcrafting
Augmented Damage II	+2 Damage Rating	Item	Gearcrafting
Augmented Damage III	+3 Damage Rating	Item	Gearcrafting

Damage Reduction Rating

100/(100 + <total damage resistance rating>)

Healing Rating

<Short Description> <Formula>

Auras

Name	Rating	Max Rating	Duration	Obtained From
Aura of Purity	+1 Healing Rating	+5 Healing Rating	Innate	Luminance

Aetheria

Name	Rating	Max Rating	Duration	Obtained From
Sigil of Growth	+1 Healing Rating	+10 Healing Rating	Innate	Aetheria

Debuffs

Name	Rating	Duration	Cast By
Festering Curse I	-10 Healing Rating	30 Seconds	Void Magic
Festering Curse II	-15 Healing Rating	30 Seconds	Void Magic
Festering Curse III	-20 Healing Rating	30 Seconds	Void Magic
Festering Curse IV	-25 Healing Rating	30 Seconds	Void Magic
Festering Curse V	-30 Healing Rating	30 Seconds	Void Magic
Festering Curse VI	-35 Healing Rating	30 Seconds	Void Magic
Festering Curse VII	-40 Healing Rating	30 Seconds	Void Magic
Incantation of Festering Curse	-45 Healing Rating	30 Seconds	Void Magic