as i remember they must be high 50 since all but a few were blue to 64. easily slowed and mezzed, even without tash. can be sk or warrior. they drop some twink stuff random, like the Grobb Hide Mask, already listed.
The dreadguards (notice the lowercap d) are all warriors. Max hit so far is 165, not sure of their exact level, but some are blue to me at 65. They run when low on health. Loot seems to be around 5pp, weapon, sometimes shield, troll parts, and occasional quest items (belt buckle linked above).
(oh - Deathguards are the SK's, and HT for 851 ... there's a way to figure out level from there somehow).