Note that speaking with this NPC will allow you to be freely buffed with Mark of the Wild (Rank 2, it seems).

On another note, your link to Mutanus is a bit off: Here's the correct link. http://classicdb.ch/?npc=3654

:)

This guy is one of two properly sized Tauren in the game, the other being the Tauren chief. You can stand next to him as a Tauren and see the size difference.

After you have killed all 4 of the Fang Leaders, talk to him to start the awakening of Naralex. He is located right at the inside of th instance. You have to escort him to Naralex but it's not too difficult. Once he gets there, a few waves of enemies will spawn and a boss, Mutanus the Devourer, at the end. Pretty good loot from the boss. No exp for awakening Naralex, but it's pretty fun.

There should be just three mobwaves before Naralex wakes up: the first consists of a small handful of Vipers (three-ish?), the second of slimes (around six?) and finally the third mob, Mutanus, who comes forth without adds. The waves come with small out of combat pauses in between.

He died while on the escort. How long does it take for him to respawn?

any quests for this guy?