I ran some Loch Modan quests until I dinged 16. After training my newest stuff, I used LFD to Tank Ragefire Chasm.
I'm a horrible tank. I forgot to switch from 2-H Mace to 1-H Sword and Shield. I changed my key mappings and wasn't familiar with the changes. I kept hitting heal instead of something else.
The party didn't say much, although the experienced Warrior did well, despite not being specced for it. We wiped twice when we aggro'd a second group of three and some of the new adds went beating on squishies.
The [Crystalline Cuffs] dropped and we got our achievement. Folks left before we could mount a serious attempt at Jergosh for the other blue.