Battle rez spells have been highly normalized in Warlords of Draenor, though there are still some slight difference between all four options which every raider should be aware of. Please read my first post on this topic for an overview of how battle resurrections work in a raid environment.
Death Knight Raise Ally
The Death Knight battle resurrection is an instant cast spell. The downside to Raise Ally is that it costs 30 Runic Power, which often requires a few seconds of power ramp up time where the Death Knight must be very careful about avoiding abilities that require Runic Power. Using Raise Ally triggers a 10 minute cooldown on the ability when not in a raid encounter.
Death Knights are the only tank class that can cast a battle rez spell without needing to wait for taunt; using Raise Ally will not expose a Death Knight to higher incoming damage like Rebirth would for a Guardian Druid. Raise Ally brings players back to life with 60% health, 20% mana, and a cosmetic 10 minute debuff called Void-Touched which gives the player a ghostly appearance. The Major Glyph of Raise Ally will remove the Runic Power cost, making this free for the Death Knight to cast.
The original battle resurrection spell. Feral and Guardian Druids have a 2 second cast time for Rebirth, while level 100 Restoration and Balance Druids have a Enhanced Rebirth, which makes Rebirth an instant cast spell. When not in a raid encounter, using Rebirth triggers a 10 minute cooldown on the ability. Rebirth will bring a player back to life with 60% health and 20% mana, but this can be modified by the Major Glyph of Rebirth which will cause players to be returned to life with 100% health and 20% mana.
Guardian Druids must be particularly careful about when they use their spell as it will force them out of Bear Form. In most circumstances, Bears should be the last ones called upon to use their battle resurrection. However, with common sense and consideration of encounter mechanics, a Bear can pull this off –just don’t expect an immediate battle rez.
Hunter (Beast Mastery Spec w/ Quillen Pet) Eternal Guardian
This is a very rare battle resurrection spell as Hunters do not always favor the Beast Mastery spec, and when they do, they don’t usually prefer to run with a quillen pet. Eternal Guardian is an instant cast spell that, when not in a raid encounter, will trigger a 10 minute cooldown on the ability. This will bring a player back with 60% health and 20% mana. There are no glyphs that modify Eternal Guardian.
Outside of raid encounters, Eternal Guardian has a unique, and very gimmicky feature: the cooldown is tied to the individual pet. A Hunter with multiple quillen pets could use Eternal Guardian, then switch to the second quillen and use it again; the first quillen is on a 10 minute cooldown, while the second was not. A Hunter could even do this while in combat (in a dungeon or world boss or group quest). Note, this will only work in non-raid situations. During a raid a pet switch would not be necessary as all of the quillens’ Eternal Guardian cooldowns would be the same time as the duration left on the charge timer (see my first post on WoD battle rezzes for more details on battle rez cooldowns during a raid encounter).
Warlocks have the unique ability to choose someone ahead of time for their Soulstone spell. Before an encounter begins, they can create a Soulstone and place it on another player. That player will receive the Soulstone buff for 15 minutes, during which, if they die, they’ll have the option to use the Soulstone and be resurrected. The main benefit of using a Soulstone before the encounter begins is that the Warlock does not still have to be alive to have a potentially useful battle rez. However it can be very difficult to predict ahead of time who might die during any given attempt.
Alternatively, the Warlock can use their Soulstone similarly to a battle rez, waiting until a character has died before using their Soulstone on them. The Warlock should ensure they have a Soulstone ready to go in their bags at the start of an encounter to eliminate cast times.
The spell Create Soulstone takes 3 seconds to cast with a 10 minute cooldown (when not in a raid encounter), and creates a conjured Soulstone. Soulstones are “unique,” meaning a Warlock can only carry one at a time. Using the conjured item is an instant action, and will give the target player a 15 minute buff. If the Warlock creates another Soulstone after their 10 minutes cooldown has expired, but before the first 15 minute buff expires on the first target player, and casts it on a new player, the old Soulstone buff will be removed on the first target player, superseded by the new cast on the new player. A Soulstone will resurrect a player with 60% health and 20% mana. This can be modified with the Major Glyph of Soulstone, which increases the amount health restored to 100%.
When using battle resurrection abilities, communication is key. The caster should announce when they are using their battle rez spell, who they are casting it on, and if it has suddenly become unsafe to accept the resurrection. If you are the usual battle rezzer for your raid and you have died, make sure you communicate this to your group so that alternatives can be quickly put into action.