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I have two answers, but bear with me. 1. Swordbearers. I'm focusing on the four of one part, because without that fit, nothing else matters. It could be argued that there are 4 swordbearers in the Crota raid, I guess. Depends on how well you do. I don't think this is the best answer. The crippled creature, I'm assuming, is Crota. 2. The Hand of Crota. He sits in a corner, he's one of the four parts of Crota (eyes, hands, heart, sword?) and until you kill the actual Hand, they just keep respawning with more cursed thrall. This is the better of my two answers.