Heirloom experience should be boosted, now that zones scale. If a zone scales along with me, it shouldn't matter if it gives me 20 levels instead of 10. I'm still enjoying the experience, even as a veteran player. I don't need to see every zone on every character again; that's the point of heirlooms. I can still enjoy the leveling experience, and the scaling, and the full outdoor experience of the zones -- and still get to the end game content I enjoy in a somewhat reasonable time as an employed adult. And the change wouldn't affect new players.
S Sanguino Alliance Sanguino Horde Sargeras Alliance Sargeras Horde Saurfang Alliance Saurfang Horde Scarshield Legion Alliance Scarshield Legion Horde Sen'jin Alliance Sen'jin Horde Shadowsong Alliance Shadowsong Horde Shattered Halls Alliance Shattered Halls Horde Shattered Hand Alliance Shattered Hand Horde Shattrath Alliance Shattrath Horde Shen'dralar Alliance Shen'dralar Horde Silvermoon Alliance Silvermoon Horde Sinstralis Alliance Sinstralis Horde Skullcrusher Alliance Skullcrusher Horde Spinebreaker Alliance Spinebreaker Horde Sporeggar Alliance Sporeggar Horde Steamwheedle Cartel Alliance Steamwheedle Cartel Horde Stormrage Alliance Stormrage Horde Stormreaver Alliance Stormreaver Horde Stormscale Alliance Stormscale Horde Sunstrider Alliance Sunstrider Horde Suramar Alliance Suramar Horde Sylvanas Alliance Sylvanas Horde

War Mode, enabled and disabled in Stormwind, gives 15% bonus experience for quests and kills in any zone. whether you're a fan of pvp or not, this might be smart to turn on as Alliance starts on Kul'Tiras and the Horde are on Zandalar. Most horde are going to only be on our island for max level world quests. If you dont like PvP, my advice would be to turn Warmode on for the first few levels, then disable it around 112.
Avatar – Avatar over Deadly Calm. Deadly Calm seems great until you use it and realize the spells you would like to spam either have cooldowns or don’t even cost rage. It mainly allows you to spam Slam for 6 seconds but I usually have enough rage to spam Slam anyways. On the other hand, Avatar’s 20% increased damage is always reliable and useful at anytime.

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These two expansions are virtually identical in terms of exp/h. I personally favor Mount Hyjal, and think it's very slightly faster. But if you know Jade Forest well you can just as easily keep up there. Ultimately you'll end up doing both anyway, so it's mostly academic. Every time I've tested Valley of Four Winds or Deepholme, or any other zone in MOP/CATA's level range, they were worse exp/h. You should not even need to complete both zones to ding 91, so it's more important to just pick one and go.
At 98 you have the option to drop what you're doing and return to your capitol city to start the quest for your Legion Artifact weapon. However, I do not believe this is necessary to do right away unless you're struggling with kill speed in your current gear. I would recommend waiting for a natural pause, such as hearthing to repair and clear your bags. From 100 to 107 you won't even really fight mobs that often; only just enough to clear the way to any treasure you need to pick up.

EXCEPTION: If you have Mining and only use Jewelcrafting to craft stone statues (for additional in-combat healing), then this may be a useful tradeskill. However, like Engineering above, it should not be a leveling focus and should only be used to assist with power leveling. Doing any more than this will become costly and should not be undertaken during the power-leveling process.
In addition to questing and running dungeons in the Broken Isles, players should also remember to visit their class hall, which is like the garrisons from Draenor, but themed around your character’s class.The quest lines in your hall provide valuable experience and open up important features, like artifact weapon upgrades, that will drastically up your character’s power.
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