Barendir

Barendir is a cave network south of Keldagrim. It can be accessed from an entrance in the south east of Keldagrim mines, and is first accessed during the quest King of the Dwarves, which it is involved in significantly. It was also the site of the Battle of Barendir. The whole area is lit by Sparkly crystals.

During King of the Dwarves, you must go to Barendir caves in order to confront Colonel Grimsson. A battle will ensue, and once Grimsson is defeated he will retreat farther into the caves. You must then convince Pretty Flower (NPC), also found within the caves, to fight Grimsson.

The item Big rock can be found in the troll cave in Barendir, which gives an emote

NPCs
Pretty flower Sparkly Crystal Big Rock (troll) My Arm