Description from original post (created 2016-01-31 16:42):
Cursed Thrall:
Spawn of Crota
Silent Brood:
"The shadows have claws."
Feral and fearless, Thrall are a plague upon the battlefield.
Their swarming, twisted frames are driven by unfettered rage. Of all the
terrors born of the Hive's vile will, they are the basest.
Source:http://db.destinytracker.com/grimoire/enemies/hive/thrall