There is no level requirement other than being able to kill all the edron orc cave monsters.
1. Go to the edron orc cave and go down to the fire mushroom/drum spawn. Kill all the orc shaman, warriors, zerkers and spearman and go through the game room to a hole down.
2. Go down and kill the leaders shaman and zerkers. You will see a gs below you. Go down and kill the gs. There will be several spawned bodies in the hole. In one of these is a dark armor.
3. go back up. somewhere else on this level is a box with poison arrows and two poison daggers