So you can pull the lower level version of this zone where mobs are light blue at level 70 with a character up to level 67.
If you pull this zone with a character 68+ the mobs will be dark blue.
The light blue zone will spawn:
Discordling Collector which drops 66-68 runes, belt (common), and ring (rare)
Dragorn Quickblade which drops 66-68 runes, cloak (common), and drum (rare)
The dark blue zone will spawn:
Discordling Hollower which drops runes (can only confirm 66-67), chain legs (common), silk tunic (rare)
Girplan Pathmaker which drops runes (can only confirm 66), plate legs (supposedly common), leather tunic (supposedly rare)
I've done the light blue zone far more so can confirm the rarity of drops there. I only did the dark blue zone for 4 spawn cycles and got 4 chain legs 0 silk tunics from 4 Discordling Hollowers and 2 leather tunics 0 plate pants from 2 Girplan Pathmakers. However, I'm told the chest pieces are the rare drops and legs common for both mobs.