Harridan

Harridans are one type of the fuck huge Tyranid Bio-Titans. Harridans however, are fuck huge Bio-Titans with wings. Because they're mostly airborne their legs have been reduced to stumps, and for some reason the moment they land is like a death sentence since they cannot take-off again... Yes, despite having EXBOXHUGE Wings they still have the same weakness as ordinary boring albatross birds. Whether this is an absurd Derp that the Hive Mind greatly needs to fix, or whether this is just maximum efficiency (most Harridans don't hit the ground until they're already dead) is up for debate.
They're basically a fucking insect dragon IN SPHESS!