Shadow Reaver's encampment | Shadow Reavers Neverwinter Nights 2 Guide

This is simple - you just have to defeat the Reaver, using either Amon or Zhjaeve's true name scrolls. Rest of the party should provide cover for the spellcaster you've chosen. Reaver has a strong team of undead to support him: a few shadows and 2 golems. Deal with them in the first place, as the reaver himself cannot be harmed in any way except the true name spell. When you manage to recite the name, he'll become vulnerable and will go down quickly. Take the shard from his body and go back to the Keep.