Special mention is the Darkmoon Faire Top Hat and WHEE! buff. While not always available due to the DMF being inaccessible most of the month, if you happen to be leveling when the DMF is running, it might be worth your time to go and get these. AFAIK they do stack with heirlooms, although I have not personally tested it. Fair warning: These buffs do NOT stack with each other, and the hats disappear after the DMF goes away later in the month(unless you only log in when the faire is running).
N Nagrand Alliance Nagrand Horde Nathrezim Alliance Nathrezim Horde Naxxramas Alliance Naxxramas Horde Nazjatar Alliance Nazjatar Horde Nefarian Alliance Nefarian Horde Nemesis Alliance Nemesis Horde Neptulon Alliance Neptulon Horde Ner'zhul Alliance Ner'zhul Horde Nera'thor Alliance Nera'thor Horde Nethersturm Alliance Nethersturm Horde Nordrassil Alliance Nordrassil Horde Norgannon Alliance Norgannon Horde Nozdormu Alliance Nozdormu Horde
By constantly doing quests, you will experience a very different game than if you just level through pure grinding. You'll be out there making a contribution towards the Alliance or the Horde. Doing these quests takes you through the heart of the game's story AND provides the fastest rate of experience. Have fun in World of Warcraft and enjoy developing your hero - your adventures will gain you great reputation amongst the land.

Madoran-Alliance-USMadoran-Horde-USMaelstrom-Alliance-USMaelstrom-Horde-USMagtheridon-Alliance-USMagtheridon-Horde-USMaiev-Alliance-USMaiev-Horde-USMal'Ganis-Alliance-USMal'Ganis-Horde-USMalfurion-Alliance-USMalfurion-Horde-USMalorne-Alliance-USMalorne-Horde-USMalygos-Alliance-USMalygos-Horde-USMannoroth-Alliance-USMannoroth-Horde-USMedivh-Alliance-USMedivh-Horde-USMisha-Alliance-USMisha-Horde-USMok'Nathal-Alliance-USMok'Nathal-Horde-USMoon Guard-Alliance-USMoon Guard-Horde-USMoonrunner-Alliance-USMoonrunner-Horde-USMug'thol-Alliance-USMug'thol-Horde-USMuradin-Alliance-USMuradin-Horde-US


Galakrond-Alliance-USGalakrond-H-USGarithos-Alliance-USGarithos-Horde-USGarona-Alliance-USGarona-Horde-USGarrosh-Alliance-USGarrosh-Horde-USGhostlands-Alliance-USGhostlands-Horde-USGilneas-Alliance-USGilneas-Horde-USGnomeregan-Alliance-USGnomeregan-Horde-USGorefiend-Alliance-USGorefiend-Horde-USGorgonnash-Alliance-USGorgonnash-Horde-USGreymane-Alliance-USGreymane-Horde-USGrizzly Hills-Alliance-USGrizzly Hills-Horde-USGul'dan-Alliance-USGul'dan-Horde-USGundrak-Alliance-USGundrak-Horde-USGurubashi-Alliance-USGurubashi-Horde-USGallywix-Alliance-USGallywix-Horde-USGoldrinn-Alliance-USGoldrinn-Horde-US
×