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Notice: we only highlight the resto shaman perspective of Mannoroth mythic. We will not cover all the mechanics.
Level 60: Echo of the Elements or Ancestral Swiftness. Both talents are viable. However, during progress on Mannoroth, Echo of the Elements will be a safer bet. It can reduce amount of lethal situations.
Mannoroth has, like Tyrant Velhari, a few abilities to keep in mind when planning to pop cooldowns.
Phase 1. The second Mark of Doom and Shadow Bolt Volley, are paired with Felseeker. You will have to move a lot and get in position for Mannoroth’s Gaze. This is why it is a good idea to (pre-)pop Ascendence with Spiritwalker’s Grace on the second Doom Lord. It is very important to be topped off before the gaze comes in. If you as a healer get targeted, you won’t be able to do anything for the duration of the gear.
On the third Mark of Doom, the Shadow Bolt Volley will come right after Mannoroth’s Gaze expires. This means massive subsequent damage on the raid. This is why this calls for massive cooldowns: consider using a combination like Healing Tide Totem, ring and Devotion Aura. It is possible to delay the doom to get it after the gaze (by dispelling it later). So how you deal with this depends on the strategy of your group.
Phase 2. This is a really short phase, no cooldowns are used (if everything goes right). You need everything for phase three. During progression your DPS might still be low enough to have cooldowns for phase 2 during the gazes.
Mannoroth’s Gaze (phase 1 and 2). When the boss casts Mannoroth’s Gaze, it will sometimes overlap with Dread Infernals spawning. Keep an eye out if they spawn in the path you are getting feared into. If this is the case, you might want to pop a Spirit Link Totem. If you run with Echo of the Elements you will also have Spirit Link Totems ready for Mannoroth’s Gaze in phase 2. However try to save them. If your phase 2 lasts very long, you could use them. If you have a short phase, then try to save them since they will be more valuable in phase 3.
Phase 3. It is a good idea to save Healing Tide Totem and Ascendance for these, along with a Spirit Link Totem. Plan it alongside the other healers on which ones you use yours. You can split them into pairs and by that you will each get a shadowforce and a felseeker where you have to pop cooldowns.
Keehn: ‘This is what our cooldown rotation looks like for phase 3: in the first Shadowforce we use Devotion Aura and Tree of Life. Once the Felseeker hits, we pop Tranquility. On the second Shadowforce we use Healing Tide Totem in combination with the ring. On the third Shadowforce, Spirit Link Totem is enough if people pair it with personal cooldowns.’
During phase 3 when soaking Empowered Mannoroth’s Gaze it will leave behind an Gazing Shadow that slows your movement. You can aid the raid by dropping Windwalk Totem. But it is very important that you don’t drop it when he casts Empowered Shadowforce or people might casually walk off the platform.
Try to avoid getting too clumped up in phase 1, to avoid getting killed by a combination of Fel Hellstorm and Fel Imps spawning. In phase 2, be ready to get into position when you know Shadowforce is about to come. Make sure you get a good angle to hit the pillars.
You can set up a rotation for dispelling the Curse of the Legion. If you have a druid, you probably want to have him deal with the dispels, since he can combine it with Ironbark. In phase 1 it doesn’t really matter whether you dispell it instantly or not. However, in phase 2 you will dispel the first instantly, but delay the second. You wait until either the Shadowforce has passed (3 or 4 seconds left), or you can let it expire. Make sure to always use an external on the the Curse of the Legion target, when the debuff gets dispelled or falls off.