Raneiks is a symptom of Bungie's stubborn refusal to acknowledge that Dungeon Boss HP pools were ballooning out of control. I think Sundered Doctrine cut some of those back (Lockset bug notwithstanding), but they've never said anything about these Boss HP bars that are larger than Raid Boss HP bars being anything but intended. What I'm getting at is that Bungie intends for that fight to be a slog, much like most of the rest of the Dungeon. That's its "theme."