Altitis

The corrupted jackal in Duviri is a decent example of the first. It's a reasonable implementation of the invuln phases with the kill adds>break leg>dodge>parazon flow to the fight (also helps that the dodge phase isn't very long). Legs do tend to just explode as soon as someone looks at them funny still, so maybe give them a little extra something so it gets one or two attacks off during that period. The attenuation on the fragmented is just boring, since at least for the normal fights, even on SP, it's basically just standing there pouring bullets into it until it finally stops moving.