You can find Ran at about 55,80. From the entrance of the path up to Krolg, keep going south along another path.

There are a fair few Bloodtooth Guards on the way up to Ran, so getting your four of those should be easy. He has one Guard that pulls with him, so make sure you clear the rest of the Guards out to give yourself some room. Be careful, though, they respawn very quickly.

Ran is a pushover once you get to him. Just focus on him and either CC the Guard, or let it hit away on you until Ran is down. Do not forget to loot Ran's head! Even though the quest from Krolg doesn't mention it, you need it to return to Raene and get your reward.

Soloable as a level 27 Shaman.

All three of my leather-armor guys (27 Druid, 26 Rogue and today - 26 Hunter) had an interesting time with Ran and his guards. The first challenge is that there are 7-10 spiders and wolves around (some are Phantom Adds). If you don't kill them in advance, they will attack you when you're busy killing the bodyguards, no matter how far away they seem to be. Some of the wolves are paired, so another will attack when you attack the first. On the other hand, the wolves have once dropped a blue and twice dropped greens, all of which were better than the rewards for the quest series (what's THAT about?).

The second challenge is that the bodyguards respawn in about 90-120 seconds, sequentially, which is not a problem when you're on your way up the hill but it means you will need to stone out or fight your way out.

The third challenge is that Ran (lvl 30) is tied to the bodyguard next to him (lvl 27). I've tried pulling the guard and tried pulling Ran. They're married. My most successful technique has been to kill all the guards sequentially, get killed by Ran on the little hill/camp to his left (your right coming up the hill), rez on the hill and kill him, as he will then be alone. Worked three times.

Those of you who know about the Rod of Dartol, please keep the secret.