Red, purple, yellow, and named yellow enemies. That's division. They all look the same and are all different levels of bullet sponges. Destiny only has bullet sponge bosses (as bosses usually are), not an entire colour coded level of bullet sponge enemy AI.
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The bosses in Destiny are the same as regular enemies (Omnigul, Psion Flayers), and some are bigger (Phogoth, Fallen Kell). The only different boss I remember in vanilla was the fallen tanks. Taken King changed it up a bit.